Patent Application
20150362140
The present invention relates to illumination technology and, more particularly, to a multi-dimensional road lighting system for use in highways, municipal roads and tunnels.
Municipal road and tunnel lighting systems use HID lamps. The light sources for highways and municipal roads have a mounting height of 10 m to 14 m, a mounting spacing of 30 m to 40 m, and a single-lamp's power of 150 W to 250 W. The light sources for tunnels are mounted on the top of the tunnels at a spacing of 2 m to 5 m and have a single-lamp's power of about 80 to 250 W. Lighting in the tunnel follows the bat-wing type distribution curve flux, which is characterized by a high single-lamp's power, high lamp installing position and large mounting spacing. These constitute the current road lighting system which can be generalized as special lamps arranged in a large power and concentrated lighting type. This road lighting system has a long history and is a mature technology. However, it has the following issues.
The highway, municipal road and tunnel lighting uses cut-off road lamps to reduce glare. These measures can depress but cannot eliminate glare. There is always a high luminance luminous surface in the cut-off road lamps. A height difference H exists between the luminous surface and a driver, such that there always exists a view angle α at which the driver can look straight at the luminous surface, which makes the driver feel the glare of the luminous surface of the top front road lamp (see
In order to change this condition, the light can be obliquely arranged such that the luminous surface of the light is parallel to the sight line of the driver toward the light (see
The glare mentioned above further generate light pollutions to nearby residences in urban areas and form rear-view glare in rear-view minors of vehicles.
In order to increase uniformity of illuminance, the current road lighting system illuminates the space below the lights as uniformly as possible to form a light curtain, resulting in a twelve-meters-high illuminating zone on the road ahead, as shown in
For closed highways, the vehicle drivers need only observe the road surface and the obstacles (with a height limit of 5.3 m) on the road ahead without the need of observing objects outside the road and above the height limit. Therefore, it is not necessary to illuminate the space outside the road and the entire space within 12 m above the road surface. Lowering the illuminating zone around the road surface to a half or even lower is logical. The illuminating space between the road surface and the height limit is referred to as a valid illuminating zone, and the rest is referred to as an invalid illuminating zone. Apparently, the drivers mainly rely on illumination in the valid illuminating zone to identify the road or obstacles ahead.
An invalid light curtain exists in the current road lighting system, which occupies approximately a half of the whole illuminating scope. This leads to an unnecessary increase of energy consumption. As evidenced later, even in the valid illuminating zone, there still exists a large proportion of invalid illuminating component in the current road lighting system.
According to the law of the inverse square, in the current (high-position) road lighting type, there is a top-bright-and-bottom-dark vertical illuminance distribution. The makes the upper invalid light curtain has a higher illuminance than the lower valid light curtain. This indicates that the current illumination for highways is also irrational regarding luminance distribution.
In the current road lighting type, the luminaire mounting spacing is about 30 m, which makes it difficult in providing a uniform vertical illuminance in the movement direction of the vehicle The vertical illuminance in some areas is very low or even close to zero.
As we know, there is a graded positive correlation between the luminance and visibility of the obstacles ahead within a mesopic vision range (see
When the average luminance is lowered to 0.1 to 0.5 cd/m2, the visibility is reduced to below 20%.
In addition, there is also a positive correlation between the surface luminance of the obstacles and the vertical luminance. The non-uniform vertical illuminance results in the space ahead in the driving direction having a non-uniform luminance, thus reducing the visibility RP value of the objects ahead (see
For municipal roads, the lamp arrangement in the current road lighting type mostly adopts an enclosed layout, in which the road lamps and street trees are arranged in the same space. When the street trees are small, they do not affect the road lamp lighting. As the street trees grow up, leaves of the trees enclose the road lamps, thus blocking part or even a majority of the light projected from the road lamps toward the road surface. As a result, the lights cannot realize the illumination function.
The above analysis indicates that the glare issue, invalid illumination issue, low visibility issue and the issue of the light blocked by trees are the persistent problems of the current large power and concentrated road lighting type.
The LED light source has the characteristics of high luminance, small size, high color rendering, low voltage safety and the capability of distributed installation.
LED light sources with small power do not have the heat dissipation issue.
In fact, simply replacing the HID light sources with the LED light sources does not change the lighting type, which not only cannot address the above four issues of the current road lighting system but also brings new issues of poor heat dissipation, poor duration and inconvenience in maintenance.
Recently, the lighting type with low-position installed road lamp has emerged. In the lighting type with low-position installed road lamp, lamps are directly mounted on a road fence or median strip, which project light to the road surface to satisfy the illumination needs of the road surface.
China Patent Application No. 201110175282.5 discloses a bidirectional low-position installed LED road lamp which uses LED as the light source. It is basically a road fence lamp. Different from a common road fence lamp that provides single side illumination, it provides double side illumination. It has been found that the road fence lamp cannot satisfy the requirements for basic road section lighting of express ways.
China Patent Application No. 200720095548.4 discloses a low-position installed road lamp which uses an MH lamp as the light source. The mounting spacing of the low-position installed road lamp is 8 m to 11 m and the mounting height is less than 1.2 m. This lighting type with low-position installed lamp partly addresses the issue of large invalid light curtain that exists in the lighting type with high-position installed road lamp. If the LED light source is used, it may partly address the heat dissipation issue that exists in the LED light source with high power. However, this low-position installed road lamp still has the following issues:
This lighting type with low-position installed lamp addresses, to some extent, the issue of large invalid light curtain that exists in the lighting type with high-position installed road lamp. However, the spacing between the light sources are reduced, which leads to an increased lateral illumination component and very small forward and backward illumination components. Analysis shows that the lateral illumination is not a valid illumination for road lighting, which provides very little contribution to providing the basic road surface luminance, providing the surface luminance of the objects ahead and increasing the luminance difference between the objects ahead and the road surface background in order for the driver to observe the road and objects ahead under normal weather conditions.
In fact, the lighting type disclosed in China Patent Application No. 200720095548.4 is not advantageous over the current road lighting system regarding power density—the main energy conservation specification. In addition, no spot application and test illumination parameters or subsequent study results have been published so far.
In this lighting type with low-position installed lamp, the backward and forward lighting components are provided by the same light source and lamp, which have the same chromaticity and illumination space. Therefore, high luminance difference and chromaticity difference between the road surface background and the object ahead cannot be established. In addition, the road surface has a low uniformity of luminance, which leads to a low visibility of the object ahead.
3. In this lighting type with low-position installed lamp, all light radiations are concentrated within the height of 1.5 meters above the road, which cannot provide the necessary space illuminance for the driver to observe the obstacles ahead.
4. This lighting type with low-position installed lamp does not completely eliminate the glare. Within the driver's visual field, the driver can still feel the glare from the front side lamps.
5. This lighting type with low-position installed lamp has the stroboscopic issue, which easily causes visual fatigue of the driver.
Recently, depressing glare by means of downward light radiation was studied in which the lamps are disposed below the visual line of the driver and the road surface obtains the necessary luminance through light distribution design. This illumination method causes three problems. Firstly, all the light radiations are concentrated within the height of 1.2 meters above the road surface, which takes into account of only the road surface lighting but not the obstacles on the road ahead. Secondly, this illumination method does not completely eliminate the glare and the driver can still feel the glare from the “luminous surface” of the front side lamps. Thirdly, it is not energy-saving.
The problem to be solved by the present invention is to develop a new road lamp solution superior over the traditional lighting type, which systematically and comprehensively addresses the glare, invalid illumination and poor visibility issues that exist in the current road lighting system, and significantly increases the lighting efficiency and visibility, thus providing a scientific lighting technology basis and useful equipment for new roads or reconstruction of existing roads.
To address the above technical problem, the present invention provides a multi-dimensional road lighting system including a multi-dimensional lighting type and luminaire dedicated for the multi-dimensional lighting type, which is used in highway, municipal road and tunnel lighting. The multi-dimensional road lighting system includes multiple dimensions of lighting subsystems including at least one dimension of backward lighting subsystem, one dimension of forward lighting subsystem and one dimension of lateral lighting subsystem. The lighting subsystems are formed by physical light sources. A light projecting direction of the backward lighting subsystem is opposite to the driving direction, a light projecting direction of the forward lighting subsystem is the same as the driving direction, and a light projecting direction of the lateral lighting subsystem is perpendicular to the driving direction.
In comparison with the prior art, the multi-dimensional road lighting system of the present invention includes ten comparatively perfect subsystems which can at the same time or selectively provide multiple dimensions of space lighting. The present invention can be used in highways, municipal roads and tunnels. The present invention is capable of addressing the disadvantages of the traditional lighting type with high-position installed lamps and the existing lighting type with low-position installed lamps. In comparison with the above-mentioned lighting type with high-position and low-position installed lamps, the present invention significantly reduces the glare and power density, greatly increases the lighting efficiency and longitudinal uniformity, and provides excellent cost/performance ratio, which can be widely used in lighting of new roads and reconstruction of existing road lamp systems.
In order to make the objectives, technical solutions and advantages become more apparent, more detailed description of the present invention is made below with reference to the drawings and embodiments. It is to be understood that the specific embodiments explained herein are intended for the purpose of description only and shall not be used to limit the present invention.
Study shows that the basic requirements for highway, municipal road and tunnel lightingroad lighting include providing basic road surface lighting, providing space lighting in front of the car, strengthening lighting under complicated weather conditions, strengthening special road section lighting, indicating accident spot and suppressing glare.
To this end, the inventor conducted a systematic theoretical and experimental study. Under the guidance of the study results, the present invention provides a new solution for road lighting—multi-dimensional road lighting system.
The multi-dimensional road lighting of the present invention includes ten main subsystems, which is based on the following theory and includes the following technical measures.
1. Road surface lighting for the purpose of increasing lighting efficiency—backward lighting subsystem with low-position installed lamps
The road surface is the main background of the obstacles ahead. The main specifications for road illumination include road surface luminance, luminance uniformity and threshold value increment. Among these specifications, the road surface luminance is the basic specification and is provided by the road surface illumination. The efficiency of road surface illumination varies greatly with different illumination manner.
The following theory deduction and experiments show that the lighting type with low-position installed lamps is the most efficient road surface lighting type among all lighting types. This conclusion is the basis of providing the present multi-dimensional road lighting system with the backward lighting subsystem with low-position installed lamps.
Current road lighting generally adopts a bat-wing type distribution curve flux (
The relationship between the various illuminance components in the backward lighting is illustrated in
E
r·v
=E
r·cos α
the horizontal reflection component is expressed as follows:
E
r·t
=E
r·sin(α+φ)·sin θ
the illuminance component of the light source along the ocular axis direction of the driver is the retinal illuminance component, which may be expressed as follows:
E
r·e
=E
r·sin(α+φ)·cos θ
where, Er·e is a valid radiation component, Er·v and Er·t are invalid components, Er is a reflecting illuminance vector of the light source reflected by the road surface, α is an incident angle of the light source, i.e. an angle between the normal line of the road surface and the light projecting direction, φ is an angle between the driver sight line direction and the road surface (observation angle), and θ is an angle between a plane in which the projected rays of light are located and a plane in which the driver sight lines are located.
The energy performance in different illumination manners is compared as follows.
The energy performance in different illumination manners is compared in terms of retinal luminance in the sight direction of the vehicle driver. The retinal luminance is in direct proportion to the road surface luminance.
The observation angle φ is set as follows: in the road illumination model, the observation angle φ=1° (in road illumination calculation, the observation angle φ usually ranges between 1.2° and 0.45° (See CIE 140-2000 ROAD LIGHTING CALCULATIONS and ILLUMINATION MEASUREMENT METHOD GB5700-2008), IESNA RP-8-2000 sets φ=1°), and the above three components can be compared as follows.
When θ<45° and α→0°,
Er·v>Er·e>Er·t.
The above inequality indicates that, in the lighting type with high-position installed lamps, the value of the invalid illumination component Er·v is the biggest and is bigger than the valid illumination component Er·e.
When θ<45° and α→90°,
Er·e>Er·t>Er·v.
The above inequality indicates that, in the lighting type with low-position installed lamps, the value of the valid illumination component Er·e is the biggest among all illumination components.
When θ>45° and α→0°,
Er·v>Er·t>Er·e.
The above inequality indicates that, in the lateral lighting with low-position installed lamps, the valid illumination component Er·e is the smallest, and the invalid illumination component is much bigger than the valid illumination component.
When θ>45° and α→90°,
Er·t>Er·e>Er·v.
The above inequality indicates that, in the lateral lighting with low-position installed lamp, the invalid illumination component Er·t is the biggest and bigger than the valid illumination component Er·e.
When θ>45° and α→0°,
Er·e=Er·e
The above equation indicates that, if in the road lighting, the light source mounted at a low position radiates the road surface in a backward direction and the radiation direction is as in consistent with the ocular axis direction of the driver as possible, then the retinal illuminance Er·e formed by the light reflected from the road surface can achieve a maximum value, and the invalid illumination component approaches to a minimum value in the lateral lighting type with low-position installed lamps, the invalid illumination component Er·t is the biggest and bigger than the valid illumination component Er·e.
When θ→0°, the light radiation direction is parallel to the lane. At this time, the light radiation amount Ee on the sight line is the biggest.
When θ→90°, the light radiation direction is perpendicular to the lane. At this time, Ee→0, which indicates the lighting efficiency is extremely low.
If the light is regularly reflected, in the backward lighting type, the horizontal radiation component and vertical radiation component are the invalid illumination components, the backward radiation component is the valid illumination component. In the backward radiation component, the energy performance of the high level radiation is much lower than the energy performance of the low level radiation.
The retinal luminance in the forward illumination manner is as follows:
The forward illumination is not shown in the drawings and is analysed below:
vertical reflection component Er·v=Er·cos α
horizontal reflection component Er·t=Er·sin(φ−α)·sin θ
retinal component Er·e=Er·sin(φ·α)·cos(180°−θ)
where, Er·e refers to the valid radiation, and the necessary condition for making Er·e meaningful is that sin (φ−α) and cos (180°−θ) are both positive values.
When sin(φ−α)>0, to achieve cos(180°−θ)>0, the angle θ must be within 90° to 270°, which does not accord with the assumption above. This means that, under the regular reflection condition, projecting the light toward the road surface in the forward illumination manner cannot provide meaningful luminance to the driver retina.
In real situations, the reflection of the light on the road surface is irregular reflection, which is a combination of regular reflection and diffuse reflection according to Lambert law.
The experiments are conducted in a dark room. A medium to be tested is used to simulate the road surface, which has a size of 1*1 m2. The reflection is of a type having 80% of specular reflection plus 20% of diffuse reflection. A 4 W LED light source is disposed on a rack and its direction is adjustable with rail and roller structures. The light source is spaced 2 meters from the medium to be tested and its angle ranges between 0° to 80°. In the experiments, the medium surface luminance is observed by a camera and an imaging luminance meter. The camera is placed at a height of 0.8 meter and at 4 meters in front of and behind the medium to be tested, which correspond to the forward lighting observation point and backward lighting observation point, respectively, to capture and measure the luminance of the medium to be tested.
The experiment simulates the four lighting types according to the table below (referring to
The experiment shows that the backward lighting type with low-position installed lamp (Backward Lighting Observation Point, incident angle is 80°) results in the highest road surface luminance, which is consistent with the above deduction result.
The above analysis indicates that, for road surface lighting, among all the lighting types, the backward lighting type with low-position installed lamps has the highest road surface lighting efficiency. In the present invention, the function of the backward lighting subsystem with low-position installed lamps is to provide the road surface luminance that meets the standard, higher uniformity of luminance and minimize the glare.
The principle of the backward lighting with low-position installed lamp eliminating glare is as follows: the light source has light luminous surface and non-light luminous surface. The fundamental reason for generating the direct glare is that the light source and the road surface are located at opposite sides of the driver, such that, while observing the road surface, the driver inevitably sees the light luminous surface of the light source, thus generating the glare. On the contrary, if the light source and the road surface are located at the same side of the driver, when the driver observes the road surface, the driver sees the non-light luminous surface of the light source and, therefore, the glare is not generated. As such, the necessary condition for eliminating the highway light glare is to dispose the lights between the driver and the road surface.
Regarding the light source for the backward lighting with low-position installed lamps, its radiation direction is opposite to the driving direction, and its radiation space includes a space below the height of lamp and the road surface (
In the multi-dimensional road lighting system of the present invention, the backward lighting subsystem with low-position installed lamps may operate in a variety of energy-saving light adjustment operating modes.
It is the basic lighting requirement to provide the space lighting of the road ahead so that the driver can effectively identify the obstacles ahead. In the present invention, the purpose of providing the forward lighting subsystem is to provide the necessary spatial luminance and higher luminance uniformity for the road ahead, and control the glare to a small value, thereby providing the driver with good space lighting of the road ahead. The following theory deduction and experiments indicate that, among all lighting types, the forward lighting type has the highest space lighting efficiency. This conclusion is the basis of providing the present multi-dimensional road lighting system with the forward lighting subsystem.
Ej is the incident angle, Es is the reflection angle, Es·e, is the driver retinal illuminance, ω is an angle between Es·e and Es (referring to
Under the regular reflection condition, Es=Ej. According to the cosine law, when a lamp illuminates an object ahead, the retinal illuminance component of the reflection vector is: Es·e=Es·cos ω. If ω→90°, then Es·e→0.
The above expressions indicate that, in order to identify the obstacles ahead, the driver sight line is substantially parallel to the road surface, and the vertical illuminance is the main illuminance component required to observe the obstacles.
The above analysis indicates that when the light source illuminates the space in front of the car from a height approximate to the eye level of drivers with a light projecting angle approximately parallel to the road surface and a radiation direction the same as the driving direction (forward lighting), it is the most beneficial for the driver to observe the obstacles.
In the experiments, the visibility evaluation method must be able to independently adjust the color of the object and the background, independently calculate their color parameters and easily calculate the visibility.
Using “visual acuity chart” is advantageous in accurately expressing visual acuity and its change amplitude, and comparing and calculating statistics of the visual acuity testing results. The visibility evaluation method based on the “E” standard logarithmic visual acuity chart is used to evaluate the effects of various factors on the visibility in the lab environment.
The experiment is conducted in a dark room. The experiment equipment include three parts: an “E” visual acuity chart box, an “E” lamp box and a background lamp box, the letter “E” and the background being independently adjustable. Two yellow and
white LED light sources are used in the experiments, each having a power of 15 Watt. The chromaticity coordinates of the yellow LED is that x=0.4293 and y=0.4200, with a color temperature of 3258K and a color rendering index of 80 (referring to
The experiments compare the effects of different object luminance and background luminance on the visual acuity and the effects of positive and negative contrast on the visual acuity under the same luminance difference ΔL between the object and the background. The experiments show that, no matter what the grey level of the background is, the regression curve gradually becomes gentle as the background luminance increases from zero. The visual acuity increases significantly at the start, but its increase rate gradually decreases with the increasing of the background luminance and finally approaches zero, with the visibility concentrated within the range of 4.6 to 5.2. For the same luminance difference ΔL between the object and the background, the visual acuity in the case of positive contrast is apparently lower than the visual acuity in the case of negative contrast (
The experiments analyse the effect of color difference on the visibility under the same background luminance. The background luminance is set as 2 cd/m2 in the experiments.
It can be concluded from the above that the road space lighting efficiency is subject to various factors. First, if the luminance is the same, the visibility in the case of positive contrast is apparently lower than the visibility in the case of negative contrast; after the luminance reaches to a certain level, the visibility no longer increases with the increase of the luminance. Second, although the effect of color contrast is less than the effect of luminance contrast on visibility, the color difference can increase the visibility at contrast values around zero, and the effect of color difference becomes less as the luminance increases. Third, the highest space lighting efficiency can be achieved when a light source with a low color temperature is used for the road lighting, a light source with a high color temperature is used for the object illumination, and a negative contrast is formed between the road surface and the object.
In the present invention, in the forward lighting subsystem, the light source radiation direction is the same as the driving direction, and the height of the light source is approximately at the eye level of the driver (
A horizontal radiation range of the forward lighting subsystem is 0° to 90° and 270° to 360° (referring to
In the multi-dimensional road lighting system of the present invention, the forward lighting subsystem may operate in a variety of energy-saving light adjustment operating modes.
Under rain, fog, haze and smoke weather conditions, the reason for the significantly reduced efficiency of the car high beam is that a great amount of aerosol molecule clusters are suspended in the air in front of the car. As a result, the light to be incident on the object in front of the car is absorbed and scattered by the water molecule clusters on the light path before the light reaches the object. The scattered light forms a white fog screen, which is referred to as “white fog effect”, thus making the driver unable to see the obstacles ahead clearly. On the other hand, the light reflected from the object in front of the car is absorbed and scattered by the aerosol molecule clusters suspended in the air, which reduces the luminance and contrast of the reflected light, thus greatly reducing the visibility of the obstacles in front of the car. The lighting condition in the middle section of a long tunnel is similar to the situation as described herein.
In the present invention, the purpose of providing the lateral lighting light source is to effectively increase the visibility of the obstacles ahead under fog and haze conditions. The basis of providing the lateral lighting light source is that, when the incident light is approximately perpendicular to the sight line of the driver, the outline of the obstacles can be most effectively shown, the “white fog effect” can be effectively overcome, such that the visibility of the obstacles ahead under the complicated weather conditions is increased. In the present invention, the function of the lateral lighting subsystem is to provide the space lighting in which the light radiation direction is approximately perpendicular to the driver sight direction. A current study shows that, whether the HID light source or the LED light source, the penetration capability of the low color temperature light source is higher than that of the high color temperature light source. Therefore, the lateral lighting subsystem uses a light source with a color temperature lower than 5000K. The radiation direction of the light source is perpendicular to the driving direction and parallel to the road surface (
In the multi-dimensional lighting system of the present invention, the light source power of the lateral lighting is not higher than 10 W. For highways and municipal roads, the lateral lighting subsystem operates in the mode that the lateral lighting subsystem is closed under normal weather conditions and only activated under rain, fog, smoke and haze weather conditions or heavy exhaust gas pollutions. For tunnel lighting, the lateral lighting subsystem is only activated in the middle section of the tunnel.
In the multi-dimensional road lighting system of the present invention, the lateral lighting subsystem may operate in a variety of energy-saving light adjustment operating modes.
In the present invention, the purpose of providing the vertical lighting subsystem is that, for highways and municipal roads, a vertical lighting subsystem is provided to indicate the position to facilitate rescue, especially air rescue.
In the present invention, the function of the vertical lighting subsystem is to provide indicator illumination which specifically indicates an accident position in the air when a rescue is needed in case of an accident. The basis for providing the vertical lighting light source is that, when a position indication is needed in case of a road surface accident, a beam of vertical light with high penetration capability may form a local placemark at a light projecting spot on the road. For the light source and lamp in the vertical lighting, its radiation direction is perpendicular to the road surface (
5. Tunnel Wall Surface Lighting for the Purpose of Addressing the “Black Hole/White Hole” Effect—Backward Lighting Subsystem with High-Position Installed Lamps
There are three special visual effects in the tunnel lighting, i.e. the “black hole” effect and “white hole” effect at opposite ends of the tunnel, and the “white fog” effect in the middle range of the tunnel. As such, the tunnel is divided into five ranges including “tunnel threshold ranges” at opposite ends of the tunnel, “tunnel transition ranges” and an interior “middle range”.
In the present invention, the special visual effects in the tunnel lighting are addressed as follows: in the tunnel threshold range, the luminance of the tunnel wall is set to be close to the luminance outside the tunnel to address the “black hole/white hole” effect; in the tunnel transition range, the luminance of the tunnel wall, especially the top wall, is set to have a gradual change from the threshold range to the middle range to improve the “adaptation to luminosity” effect; in the middle range, the incident angle of the light source is set to be approximately perpendicular to the driver sight line to address the “white fog” effect.
The function of the tunnel wall lighting is to address the special visual effects in the tunnel lighting, i.e. the “black hole” and “white hole” effects. In the tunnel threshold range, the measure taken is to set the luminance of the tunnel wall to be close to the luminance outside the tunnel. It can be easily deduced that the tunnel wall lighting follows the conclusion that is made with respect to the backward lighting, i.e. the backward lighting type with high-position installed lamps has the highest wall lighting efficiency among all lighting types.
The basic principle of the backward lighting type with high-position installed lamps is that: in the inside of the tunnel, when the light source illuminates the wall surface ahead in a radiation direction the same as the driving direction and with a light projecting angle such that the radiation direction is approximately perpendicular to a normal line of the wall surface, a higher wall reflective luminance and a higher uniformity of luminance can be achieved along the driver sight line and the glare can be controlled to a smaller value. In the present invention, the requirements for the backward lighting subsystem with high-position installed lamps include that the wall luminance is provided in a backward lighting manner with high-position installed lamps, which has a gradual change between the threshold range and the tunnel inside range to improve the “adaptation to luminosity” effect. The illumination space of the backward lighting subsystem with high-position installed lamps includes the space and wall above the height of lamp, its light distribution has no downward scattering (
Municipal road lighting requires a desired surround ratio in addition to the lighting of the road itself, such that the driver is able to recognize any possible moving object beside the road during driving. Therefore, when the multi-dimensional road lighting system of the present invention is used in municipal roads, in addition to the backward lighting subsystem, forward lighting subsystem, lateral lighting subsystem, the multiple-dimensional road lighting system further includes the side lighting subsystem. The function of the side lighting subsystem is to satisfy the environmental luminance ratio by using a middle level light source to radiate scattered light with low color temperature and high color rendering index to the outside of the road.
Lamps are arranged in a manner of “road center line single row lamp distribution” (
In the present invention, the function of the display lighting subsystem is to deliver real-time video signals and display picture and text information to guide cars to pass orderly. The basic principle of the display lighting subsystem is that: in digital cities, smart traffic direction systems need to timely provide traffic information to drivers and issue directions of traffic direction department to the drivers through audio signals or video signals. The light source and lamps used in the display lighting are LED/OLED displays or dot matrixes, which have a radiation direction oblique to the driving direction. The display lighting subsystem is activated and controlled by the traffic direction department (
In the present invention, the function of the landscape lighting subsystem is to provide landscape lighting which constitutes a night landscape element in the city and creates a festival atmosphere, while not affecting driving safety.
In the present invention, the landscape lighting subsystem is mainly used in municipal roads or bridges in combination with the above described functional lighting subsystems to form an integrated lamp. The landscape lighting subsystem operates independently and is controlled separately by a city management department or controlled by the traffic direction department.
The objective of the multi-dimensional road lighting system is to completely eliminate the road lamp glare. The road lamp glare includes the glare when the driver looks ahead (front-view glare), the glare from the rear-view minor (rear-view glare) and the glare to the residence near the street (residence glare).
Studies show that the source of the front-view glare includes: 1) the light source of the backward lighting with low(high)-position installed lamps for a lane that causes glare to the driver in the same lane, and 2) the light sources of the forward lighting and lateral lighting for a lane that cause glare to the driver in an opposite lane; the source of the rear-view glare includes the light sources of the forward lighting and lateral lighting for a lane that cause glare to the driver in the same lane.
It is discovered that the necessary condition for eliminating the front-view glare is to dispose the luminous surface and the road surface at the same side of the driver, i.e. the road lamp is disposed between the driver and the road surface, and a cut-off plate is disposed; the necessary condition for eliminating the rear-view glare is to reduce the luminance of the unit luminous surface; the necessary condition for eliminating the residence glare is to arrange a cut-off plate to cut off the direct light path between the road lamp and the residence nearby.
In the present invention, the cut-off plate subsystem is arranged in the multi-dimensional lighting system as comprehensive measures to eliminate the glare. There are two types of measures including top and/or bottom cut-off plates disposed on the lamp for the highway, municipal road and tunnel lighting and shutter-style anti-glare grids added to the median strips of the highways (
The current road lighting is concentrated lighting with a single-HID-lamp's power of 250 W and a single-LED-lamp's power of 150 W. When the current photovoltaic technology is used in the concentrated lighting condition, it is unreliable if the solar energy is used as the sole power supply. To increase reliability, a dual power supply is required.
One important feature of the multi-dimensional road lighting system of the present invention is reducing the single-lamp's power to 2-3 W and reducing the lamp mounting spacing to 2 to 8 meters. In comparison with the current road lighting, the present multi-dimensional road lighting system is featured by a distributed and small scale lighting. The single-lamp power of the multi-dimensional road lighting system is only 1% to 2% of the single-lamp's power of the concentrated lighting, which greatly reduces the single-lamp photovoltaic cell size and storage parts as well as the effect of single-lamp failure. Therefore, this can increase the power supply reliability, thus enabling an integrated road lamp which uses the solar energy as the sole power supply (
In summary, the above ten key subsystems form the new road lighting system of the present invention—multi-dimensional road lighting system. The multi-dimensional road lighting system includes a multi-dimensional lighting type and a lamp dedicated for the lighting type.
The multi-dimensional road lighting system is an organic whole and is used with suitable combinations of the subsystems according to different applications. When used in highways, some or all of the backward lighting, forward lighting, vertical lighting subsystems with low-position installed lamp and photovoltaic subsystem can be used in combination. When used in tunnels, some or all of the backward lighting with low-position installed lamp, backward lighting with high-position installed lamp, forward lighting, and lateral lighting subsystems can be used in combination. When used in municipal roads, some or all of the backward lighting, forward lighting with low-position installed lamp, lateral lighting, vertical lighting, side lighting, display lighting, landscape lighting, cut-off plate and photovoltaic subsystem can be used in combination.
Operation modes of the lighting subsystems include a normal mode and an abnormal mode. The normal mode includes a general mode and an energy-saving mode. The abnormal mode includes an urgent mode and an indication mode. In the normal mode, when the lighting system is used in the tunnel illumination, the general mode is that the backward lighting subsystem, forward lighting subsystem and the lateral lighting subsystem operate in full power within a normal light-on period. When the lighting system is used in highway and municipal road illumination, the general mode is that the backward lighting subsystem and forward lighting subsystem operate in full power within a normal light-on period. In the energy-saving mode, a light adjustment is performed on the basis of the general mode. In the abnormal mode, when the lighting system is used in highway and municipal road illumination, the urgent mode is that the lateral lighting subsystem is activated under haze weather conditions or in urgent situations and the indication mode is that the vertical lighting subsystem is activated when an indication is needed.
The fixing device of the lamp body includes a lamp housing. The light source is mounted in the lamp housing. The backward lighting light source, the forward lighting light source and lateral lighting light source are disposed on the front side of the lamp housing, the backward lighting light source and the forward lighting light source are symmetrically disposed on left and right sides of the lateral lighting light source or top and bottom sides of the lateral lighting light source. The vertical lighting light source is disposed on the top of the lamp housing.
The front-view glare is eliminated by appropriate light distribution of the lamps, the provision of the top and/or bottom cut-off plates, and the shutter type anti-glare light grid on the center median strip. The rear-view glare is eliminated by reducing the luminance of the forward lighting light source. The residence glare is eliminated by providing the lamp with the top cut-off plate.
The multi-dimensional road lighting system includes multiple dimensions of lighting subsystems including at least one dimension of backward lighting subsystem, one dimension of forward lighting subsystem and one dimension of lateral lighting subsystem, with each dimension of lighting subsystem formed by a physical light source. The light projecting direction of the backward lighting subsystem is opposite to the driving direction, the light projecting direction of the forward lighting subsystem is the same as the driving direction, and the light projecting direction of the lateral lighting subsystem is perpendicular to the driving direction.
The backward lighting subsystem includes a backward lighting subsystem with low-position installed lamps and a backward lighting subsystem with high-position installed lamps. The height of lamp of the backward lighting subsystem with low-position installed lamps is lower than the eye level of the driver, a horizontal radiation range is 90° to 180°, 180° to 270°, and a vertical radiation range is 180° to 270°. The radiation space is below the light source position without upward scattering. The height of lamp of the backward lighting subsystem with high-position installed lamps is higher than the eye level of the driver, a horizontal radiation range is 90° to 270°, and a vertical radiation range is 140° to 180°. The radiation space is above the light source position without downward scattering. When the lighting system is used in the highway and municipal road lighting, the backward lighting subsystem is the backward lighting subsystem with low-position installed lamps. When the lighting system is used in tunnel lighting, the backward lighting subsystem includes the backward lighting subsystem with low-position installed lamps and backward lighting subsystem with high-position installed lamps.
The horizontal radiation range of the forward lighting subsystem is 0° to 90°, 270° to 360°, the vertical radiation range is 350° to 40°, and the radiation space is mainly above the height of lamp. The horizontal radiation range of the lateral lighting subsystem is 0° to 180°, 180° to 360°, and the radiation space includes the space above and below the height of lamp and the road surface.
When the lighting system is used in highways and municipal roads, the lighting system further includes a dimension of vertical lighting subsystem. The light projecting direction of the vertical lighting subsystem is perpendicular to the road surface, the radiation range is 87° to 93°, and the radiation space is above the road.
The multiple dimensions of lighting subsystems are divided into multiple groups, with each group of the lighting subsystems separately disposed or integrated together. Operation modes of the lighting subsystems include a normal mode and an abnormal mode. The normal mode includes a general mode and an energy-saving mode. The abnormal mode includes an urgent mode and an indication mode. In the normal mode, when the lighting system is used in the tunnel lighting, the general mode is that the backward lighting subsystem, forward lighting subsystem and the lateral lighting subsystem operate in full power within a normal light-on period. When the lighting system is used in highway and municipal road lighting, the general mode is that the backward lighting subsystem and forward lighting subsystem operate in full power within a normal light-on period. In the energy-saving mode, a light adjustment is performed on the basis of the general mode. In the abnormal mode, when the lighting system is used in highway and municipal road lighting, the urgent mode is that the lateral lighting subsystem is activated under haze weather conditions or in urgent situations and the indication mode is that the vertical lighting subsystem is activated when an indication is needed.
A lamp of the multi-dimensional road lighting system includes a lamp body, a device body, and a pipeline. The lamp body includes a light source and a fixing device. The device body includes a power supply circuit, a driving circuit or a photovoltaic system, a control circuit and a fixing device. The pipeline includes a conductive wire and a protective tube. The lamp is used in the multi-dimensional road lighting system for highway, municipal road and tunnel lighting. The light source at least includes a backward lighting light source, a forward lighting light source and a lateral lighting light source. The light projecting direction of the backward lighting light source is opposite to the driving direction, the light projecting direction of the forward lighting light source is the same as the driving direction, and the light projecting direction of the lateral lighting light source is perpendicular to the driving direction.
The lamp of the multi-dimensional road lighting system is described below in detail in junction with different applications including highway, municipal road and tunnel lighting.
The lamp housing 12 is a laterally disposed rectangular hollow housing which acts as the fixing device of the lamp body. The cross-section of the lamp housing 12 may be circular, oval, triangular or polygonal in shape. The lamp housing 12 has a waterproof level no less than IP 65. A rear side of the lamp housing 12 extends outward to form a screw-hole plate 5. The lamp housing 12 is mounted to a road fence or anti-collision wall. The lamp housing 12 has an access opening at a top side thereof. A cover for the access opening is provided with a plurality of heat sink fins 4. The lamp housing 12 may be made of engineering plastics, aluminium or steel. A circuit is disposed in the lamp housing 12. A reflective film may be attached to a front side of the lamp housing 12 to increase the driving safety in case of a sudden power outage. A sign of road section code may be attached to the lamp housing 12, thus allowing for the providing of an accurate position of an accident to reduce rescue time.
The vertical lighting light source 1 is disposed on the top side of the lamp housing 12. The backward lighting light source 3, forward lighting light source 6 and lateral lighting light source 8 are disposed on the front side of the lamp housing 12. The backward lighting light source 3 and the forward lighting light source 6 are symmetrically disposed on left and right sides of the lateral lighting light source 8 and have opposite radiation directions. A top cut-off plate 2 is disposed at a top side of the backward lighting light source 3 to cut off the upward light such that the backward lighting light source 3 has no upward scattering. The top cut-off plate 2 is reinforced by reinforcement ribs. A bottom cut-off plate 7 is disposed at a bottom side of the forward lighting light source 6 to cut off the downward light such that the forward lighting light source 6 has no downward scattering. The bottom cut-off plate 7 is reinforced by reinforcement ribs.
As shown in
In an embodiment of
In an embodiment of
The lamp body 110 may be made of engineering plastics, aluminium or steel. The cross-section of the lamp body 110 may be circular, oval, triangular or polygonal in shape. The lamp body 110 has a waterproof level of no less than IP 65. The lamp body 110 is connected to another lamp body via an electric cable. The lamp body 110 is mounted at a height between 1.5 m to 5 m and at an interval between 2 m to 12 m. In addition, the lamp body 110 may have a waterproof access opening for allowing inspection and maintenance of components in the lamp body 110. Referring to
The fixing device 130 may be screws or brackets disposed on the lamp body 110, which can fix the lamp body 110 to a center line of the road and road surfaces/low walls at road sides.
The light source 120 includes a backward lighting light source with low-position installed lamp, a forward lighting light source with middle-position installed lamp, a lateral lighting light source with middle-position installed lamp, a vertical lighting light source and an information display apparatus and landscape lighting light source. These light sources for different purposes operate independently. The radiation space of the backward lighting light source with low-position installed lamp includes the space below the height of lamp and the road surface. In addition, a top cut-off plate may be disposed above the backward lighting light source with low-position installed lamp, such that the backward lighting light source with low-position installed lamp has no upward scattering.
When the above lamp 100 is used in narrow road sections, the lamps may be arranged in a manner of “road center line single row lamp distribution” as shown in
When the lamps of the present invention are used in highways and municipal roads, multiple groups of lamp bodies may be arranged according to needs, which are distributed along the lateral road sides. The mounting interval between two adjacent groups of lamp bodies is not greater than 10 m. The lamps are mounted at a height not higher than 4 m. The position of the backward lighting light source is lower than 1.5 m, and a top cut-off plate is disposed above the backward lighting light source.
The high-position installed luminaire includes a hollow lamp body 122, a dimension of backward lighting light source 124 with high-position installed lamp mounted on the lamp body 122, a bottom cut-off plate 126, and a fixing device 128. The lamp body 122 may be made of engineering plastics, aluminum or steel. The cross-section of the lamp body 122 may be circular, oval, triangular or polygonal in shape. The lamp body 122 has a waterproof level of no less than IP 65. Electric cables between the lamp bodies 122 are connected via waterproof junction boxes or waterproof joints. The bottom cut-off plate 126 is disposed on the lamp body 122 below the backward lighting light source 124 with high-position installed lamp, such that backward lighting light source 124 with high-position installed lamp has no downward scattering. The fixing device 128 is disposed above the lamp body 122. The high-position installed lamp is mounted at a height higher than 1.5 m. Multiple high-position installed luminaires may be spacedly fixed to the wall on lateral sides of the tunnel by the fixing devices 128 (
Referring to
The lateral lighting light source 143 is disposed at a middle portion of the lamp body 141. The backward lighting light source 142 with low-position installed lamp and the forward lighting light source 144 with low-position installed lamp are disposed on the lamp body 141 and on opposite sides of the lateral lighting light source 143. The light projecting direction of the backward lighting light source 142 with low-position installed lamp is opposite to the driving direction. The top cut-off plate 145 is disposed on the lamp body 141 above the backward lighting light source 142 with low-position installed lamp, such that the backward lighting light source 142 with low-position installed lamp has no upward scattering. The light projecting direction of the forward lighting light source 144 with low-position installed lamp is the same as the driving direction, and the radiation space is above the height of lamp. The bottom cut-off plate 146 is disposed on the lamp body 141 below the forward lighting light source 144 with low-position installed lamp, such that the forward lighting light source 144 with low-position installed lamp has no upward scattering.
The heat dissipation devices 148 are disposed on the lamp body 141. The heat dissipation devices 148 correspond to the backward lighting light source 142 with low-position installed lamp, the lateral lighting light source 143, and the forward lighting light source 144 with low-position installed lamp, for dissipating the heat of the backward lighting light source 142 with low-position installed lamp, the lateral lighting light source 143, and the forward lighting light source 144 with low-position installed lamp, thus ensuring stable operation of the backward lighting light source 142 with low-position installed lamp, the lateral lighting light source 143, and the forward lighting light source 144 with low-position installed lamp.
The fixing device is disposed on the lamp body 141 for fixing the low-position installed luminaire. As shown in
In various embodiments above, the operation status of the backward lighting light source, forward lighting light source, lateral lighting light source, vertical lighting light source and display lighting light source may be controlled independently. There may be two control manners—control through power supply circuit: the power supply circuit for each of the light sources for different purposes is a separate loop circuit that operates independently, and the operation status of the light source is controlled by its corresponding power supply circuit; and control through control circuit: all the light sources are commonly supplied with power, and an additional control circuit/module is added to remotely control the operation status of the light sources.
When the luminaire is used in a highway, the device body and lamp body are combined into an integrated luminaire. Alternatively, the device body is separately fixed to an outside of the road fence or on the road fence and is connected to the lamp body or another device body through a pipeline. When the luminaire is used in a municipal road, the device body and lamp body are combined into an integrated luminaire which is connected to another luminaire through a pipeline. When the luminaire is used in a tunnel, the device body is fixed on or into a sidewall of the tunnel and is connected to the lamp body or another device body through a pipeline.
In various embodiments described above, the power of the backward lighting light source is not greater than 8 W, the color temperature is not higher than 4000K, and the backward lighting light source has an asymmetric distribution curve flux. The power of the forward lighting light source is not greater than 8 W, the color temperature is higher than 4000K, and the forward lighting light source has an asymmetric distribution curve flux, and the color rendering index is greater than 70. The power of the lateral lighting subsystem is not greater than 10 W, and the color temperature is lower than 5000K.
When the lamp is used in the highway or municipal road, the light source further includes a vertical lighting light source which has a power not higher than 10 W and a mounting interval not greater than 2 Km.
When the above lamp is used in a municipal road, the lamp body further includes an apparatus and light source for information display and landscape lighting. The light sources for different purposes are commonly supplied with power and operate independently. When the luminaire is used in a highway or municipal road, the luminaire may be commonly supplied with a road lamp power supply, independently powered by their respective photovoltaic electricity generating systems or powered by a combination of the two types of power supply.
When the luminaire is used in a tunnel, the mounting spacing between adjacent lamp bodies is not greater than 5 m. The backward lighting light source includes a backward lighting light source with low-position installed lamp and a backward lighting light source with high-position installed lamp. The backward lighting light source with low-position installed lamp is lower than 1.5 m, and the backward lighting light source with high-position installed lamp is higher than 1.5 m. The lamp body further includes a high-position lamp body and a low-position lamp body. The backward lighting light source with high-position installed lamp is mounted on the high-position lamp body. The lateral lighting light source, backward lighting light source with low-position installed lamp and forward lighting light source with low-position installed lamp are disposed on the low-position lamp body, and the backward lighting light source with low-position installed lamp and forward lighting light source with low-position installed lamp are on opposite sides of the lateral lighting light source. The high-position lamp body includes a bottom cut-off plate below the high-position lighting light source. The low-position lamp body includes a top cut-off plate above the low-position backward lighting light source.
Key features of the above multi-dimensional road lighting system include completely eliminating glare including the front-view glare, rear-view glare and residence glare. The measures taken to eliminate the front-view glare includes appropriate light distribution of the lamps, the provision of the top and/or bottom cut-off plates, and the shutter type anti-glare grid on the center median strip. The measure taken to eliminate the rear-view glare is reducing the luminance of the forward lighting light source. The measure taken to eliminate the residence glare is providing the lamp with the top cut-off plate.
The multi-dimensional road lighting system of the present invention has the following advantages.
1. Comparison with the Current Road Lighting System
There is a large space with valid illumination in the current road lighting system, and there is a large invalid illumination component even in the space with valid illumination, which leads to a low lighting efficiency of the current road lighting system. The essence is that the radiation space is too large, an unnecessary area is radiated, and the radiation direction is unreasonable. In the multi-dimensional road lighting system, the measures for increasing the lighting efficiency include that: firstly, the illumination area is significantly reduced, which avoids the high invalid illumination area; secondly, the radiation space and luminance distribution are reasonable, for the road surface lighting, the road surface lighting efficiency of the backward lighting subsystem with low-position installed lamp is much higher than that of the current concentrated lighting with high-position installed lamp, for the lighting of obstacles ahead, the space lighting efficiency of the forward lighting subsystem is much higher than that of the current concentrated lighting with high-position installed lamp, for the tunnel wall lighting, the lighting efficiency of the backward lighting subsystem with high-position installed lamp under haze conditions is much higher than the current tunnel lighting. Therefore, the power density is much lower than the current road lighting system.
In the current road lighting system, the backward light projection component causes the direct glare from the top front space to the driver driving in his lane, the forward light projection component causes the direct glare from the top front space to the driver driving in the opposite lane, and inevitably causes light pollution to residence nearby.
This inventor sums up the conclusion that the road lamp glare includes the front-view glare, rear-view glare and residence glare, and his study indicates the necessary conditions for eliminating the road lamp glare. The multi-dimensional road lighting system of the present invention takes top cut-off measure, bottom cut-off measure and cut-off plate comprehensive measure to shield the glare to the driver and to the residence nearby, thus significantly reducing the glare index in comparison with the current road lighting system.
Study shows that when the road surface lighting uses a low color temperature light source, the illumination of the object ahead uses a high color temperature light source, and a negative contrast is formed, the space lighting efficiency can be effectively increased.
Accordingly, the multi-dimensional road lighting system of the present invention separates the illumination spaces of the backward lighting component and the forward lighting component and light adjustment is performed independently to form a strong luminance contrast between the road surface background and the object ahead. The color contrast is enhanced by controlling the color of the backward illumination component and the forward lighting component. These two measures both increase the visibility of the object ahead in comparison with the current road lighting system.
The heat dissipation issue of LED light source has been the bottleneck of the development of LED road lamp. One importance achievement of the multi-dimensional road lighting system of the present invention is realizing the distributed arrangement of the lamp positions and small scale of the lamps. A direct advantage of this achievement is that the heat dissipation issue of the LED light source in the concentrated illumination is addressed. And no technology development or dedicated fees are needed for addressing the heat dissipation issue.
When compared with the traditional large power and concentrated road lighting, the multi-dimensional road lighting system of the present invention does not need dedicated steel lamp poles, and the lamp mounting height is lower. The lamps can be mounted to the road fence or anti-collision wall, which makes the on-site assembly simple. In addition, this facilitates the maintenance of the lamps, and the lamps can be replaced without closing the lane.
In the present invention, the lighting subsystems and control circuits are integrated into the lamp housing. The photovoltaic electricity generating system is disposed on the road fence or anti-collision wall, its assembly is simple and its removal is convenient. The light source of each lighting subsystem forms its own loop circuit that operates independently.
Therefore, the one-time invest as well as operational cost of the multi-dimensional lighting system of the present invention is significantly reduced when compared with the current road lighting system.
2. Comparison with the Current Lighting Type with Low-Position Installed Lamp
In comparison with the low-position installed road lamp technology of China Patent No. 200720095548.4, the present invention is completely different in illumination principle, main function, radiation direction, radiation space and operation manner. The multi-dimensional road lighting system of the present invention is not limited to the lighting type with low-position installed lamp, but includes lighting systems with low-position, middle-position and high-position installed lamps according to different applications. For example, the backward lighting subsystem with low-position installed lamp functions to provide the road surface lighting and is thus of low-position installed. However, the forward lighting subsystem functions to provide the space lighting of the road ahead to the driver and is not limited to the low-position installation. The backward lighting subsystem with high-position installed lamp is used in tunnel lighting and is of high-position installed.
As can be readily seen, the low-position installed road lamp technology of China Patent No. 200720095548.4 is similar to only one dimension of illumination component of the present invention—lateral lighting subsystem. However, the lateral lighting subsystem of the present invention does not provide the road lighting under normal weather conditions but is only used as an auxiliary lighting subsystem. The function of the lateral lighting subsystem is to increase the visibility under complicated weather conditions. Contrary to the lighting type of the low-position installed road lamp technology of China Patent No. 200720095548.4, the lateral lighting subsystem of the present invention is deactivated under normal weather conditions but is only activated under rain, fog, smoke and haze conditions. In the present invention, the backward lighting subsystem provides the road surface lighting under normal weather conditions, its radiation manner is backward radiation without upward scattering, which greatly increases the road surface luminance along the driver sight line direction, greatly reduces the glare, and significantly increases the longitudinal uniformity. When the forward lighting subsystem that provides the space lighting under normal weather conditions is used in combination with the backward lighting subsystem, the visibility of the obstacles ahead can be increased by enhancing the luminance contrast and color contrast between the obstacles and the road surface background. These are not disclosed in the low-position installed road lamp technology of China Patent No. 200720095548.4.
In essence, the multi-dimensional road lighting system of the present invention realizes multiple dimensions of illumination by means of distributed lamp arrangement and small power of the lamps. The multiple dimensions of lighting subsystems include light sources with different radiation directions. Different light sources are combined for illumination depending on actual requirements. The light sources for different purposes each perform its own function and maximize its own performance, thus optimizing the illumination result. For example, the backward lighting is used as basic lighting and is constantly activated during the normal light-on period. The forward lighting acting as space lighting is activated in some time-sections during the normal light-on period. The lateral lighting is only used as an auxiliary lighting which is deactivated under normal weather conditions but is only activated under rain, fog, smoke and haze conditions to increase the visibility under complicated weather conditions. The present invention fundamentally addresses the glare and invalid illumination issue and has good photometry indexes, thus reducing energy consumption.
The following table shows a technical comparison between the multi-dimensional road lighting type of the present invention and other lighting type.
Expected return: the multi-dimensional road lighting system has the apparent energy-saving, glare-free and low cost advantages.
The following table compares technical and economic indexes of the HID lamp and LED lamp between the multi-dimensional road lighting and the current illumination manner.
In summary, the present invention takes advantages of the small power and high performance of the LED light source and is a result of independent application-type research and development which is based on plenty of experiments according to the basic needs of the road lighting. The multi-dimensional road lighting system does not merely improve and correct the current road lighting, but is a fundamental innovation to the road lighting type and lighting devices. In essence, in the current lighting types with low-position and high-position installed lamps, one lamp is used to fulfil three tasks simultaneously—road surface lighting, space lighting as well as lighting under complicated weather conditions/wall lighting. These tasks are mutually restricted in space and time and cannot be all optimized at the same time. In the present invention, the above tasks are separated apart and each task is executed independently by a small power, high efficiency light source, lamp and illumination control system, the road surface lighting, space lighting and lighting under complicated weather conditions/tunnel wall lighting can be respectively optimized to achieve an overall optimized result. In comparison with the prior art, the multi-dimensional road lighting system of the present invention includes ten comparatively perfect independent subsystems which can at the same time or selectively provide multiple dimensions of space lighting. The present invention can be used in highways, municipal roads and tunnels. The present invention is capable of addressing the disadvantages of the traditional lighting type with high-position installed lamp and the current lighting type with low-position installed lamp. The present invention addresses the issues of glare and invalid illumination, significantly increases the lighting efficiency and power consumption and, at the same time, provides good road lighting photometry indexes and excellent cost/performance ratio, which shows the apparent advanced nature of the present invention. The multi-dimensional road lighting system can be used in lighting of new roads as well as reconstruction of existing road lamp systems.
The above are only the apparent embodiments of the present invention, which will not be used to restrict the scope of the present invention. It is intended that any modifications, the equivalents or promotion is covered in the scope of the present invention provided that they are in accord with the spirits or principle of the invention.
| Number | Date | Country | Kind |
|---|---|---|---|
| 201210334212.4 | Sep 2012 | CN | national |
| 201210334213.9 | Sep 2012 | CN | national |
| 201210334214.3 | Sep 2012 | CN | national |
| 201210334215.8 | Sep 2012 | CN | national |
| 201210334281.5 | Sep 2012 | CN | national |
| 201210334282.X | Sep 2012 | CN | national |
This patent application is a continuation application of International Patent Application No. PCT/CN2013/083351, which application was filed on Sep. 11, 2013. International Patent Application No. PCT/CN2013/083351 is incorporated by reference.
| Number | Date | Country | |
|---|---|---|---|
| Parent | PCT/CN2013/083351 | Sep 2013 | US |
| Child | 14644781 | US |
