Embodiments of the present invention provide for an apparatus, system, and method for creating a composite beam from individually aimable LEDs (or other individual light sources) and associated optics such as reflectors or lenses, which is well adapted for use with lighting fixtures and systems including those used to light sidewalks, walkways, parks, etc. such as those discussed in patent application Ser. No. 12/466,640 filed May 15, 2009, issued as U.S. Pat. No. 8,256,921 on Sep. 4, 2012, and which is incorporated by reference herein. Other individual light sources could include LED packages with multiple LEDs (such as ROB, ROBA, RGBW), grouped LEDs, or plural groups of LEDs.
Individual light sources may include optics with elements such as reflectors, refractive lenses, holographic diffusive lenses, and/or other elements. Each individual optic, according to embodiments of the present invention, is part of an array of optics which may be installed and aimed individually, or may be positioned and aimed as part of a lighting design plan and thus placed in a specific location relative to the fixture and/or the other light sources, the fixture itself being oriented on site according to the lighting design plan.
The arrangement of the LED light sources could be, e.g., a ring-shaped grouping, particularly such as might fit around a post or pole, or it could be an array of rows, a circular, radial, spiral pattern or another pattern or shape. The individual optics could be mounted in the fixture by a means that also provides for adjustment in one or more directions relative to the light sources so as to vary the location of the individual beam within the composite beam. Adjustment of the LED light sources could be done on site or preset by the manufacturing or assembly process; if preset, the positioning of individual optic components in the fixture could be adjusted or fine-tuned at installation or at a later time.
Unlike conventional lighting fixtures, embodiments of the present invention can provide ‘granular’ or ‘pixilated’ control of light at a high level of precision, wherein for a given application, small areas, which could be on the order of 1 square meter (more or less according to lens design, mounting height, fixture mounting angle, etc.), can have brightness somewhat controlled. This allows areas within the target area to be emphasized. For buildings, signs, or other applications where a sharply defined shape is to be illuminated, these embodiments provide greater flexibility than conventional lighting.
The present invention relates to an apparatus, method, and system for customizable light output from solid state light sources including but not limited to LEDs as well as possibly other light sources.
One aspect of the invention includes an apparatus which allows the light source to be adjustably mounted and fixable in a given orientation relative to at least one degree freedom of movement, if not more.
Another aspect of the invention includes an adjustably mountable light source having optics that can be selected or adjusted to change light output pattern and/or color of the light output pattern.
Another aspect of the invention includes a plurality of adjustably mountable light sources that can include adjustable light output pattern or color from any of the plurality of sources.
Another aspect of the invention comprises a method of lighting wherein a plurality of light sources are each individually adjusted, the optics are individually selected, and their positions are selected relative to a target to create highly customizable lighting relative the target.
Another aspect of the invention comprises creating a composite lighting with different light outputs from plural adjustable light sources.
Another aspect of the invention comprises utilizing highly adjustable plural light sources with other light sources that may not be highly adjustable.
Embodiments of the present invention provide for an apparatus, system, and method for creating a composite beam from a plurality of individually aimable LEDs (or other individual light sources) and associated optics such as reflectors or lenses. The composite beam can be comprised of light beams from a single fixture (see
An apparatus according to aspects of the invention comprises an adjustable light 1000,
As embodied, base 1001 and light mount 1004 each have a diameter of approximately 1 inch. Light source 1000 as embodied allows approximately 45° freedom of motion of the light mount 1004 from horizontal, and 360° rotation about the base 1001. Other sizes and range(s) of movement are, of course, possible according to desire or need.
Design of the light requires that principles of thermal management well known to those in the art be practiced. The formula TJunction=TA+(Pd)(RthetaJ−A) allows the designer to calculate power dissipation levels where TJunction is junction temperature of the LED, TA is power dissipated by the LED, and RthetaJ−A is thermal resistance between the LED junction and ambient air. Also, modifying the knuckle joint by reducing or increasing contact area will change the thermal resistance of the joint. Heat transfer paste may be used. Further information may be found in the publication from Philips Lumileds Lighting Company, “Thermal Design Using Luxeon® Power Light Sources”, Application Brief AB05, San Jose, Calif., Philips Lumileds Lighting Company, 2006, pp. 1-12 available at www.philipslumileds.com/pdfs/AB05.pdf, which is incorporated by reference herein.
Base 1001 and a moveable light mount 1004 are machined aluminum but could be of, e.g., copper for purposes of high heat transfer capability, or of other materials such as plastic, zinc or white metal die casting, etc., particularly if alternate methods of heat transfer are selected, depending on thermal transfer needs of the LED.
Optics 1003, based on principles as discussed herein, may optionally be mounted relative to light source 1002. For example, lens 1010 is mounted on LED mount 1004 to modify or direct light from LED source 1002. Housing 1011 holds cushioning O-ring 1012 against lens 1010 which is positioned on the LED mount 1004. Tabs 1013 on the housing snap around mount 1004 thereby firmly but removably affixing lens 1010 to mount 1004.
Another apparatus according to aspects of the invention comprises an adjustable light source 901,
As embodied, ball 912 and socket 906 each have a radius of approximately 0.5 inch. Follower 904 and socket 913 each have a radius of approximately 0.25 inch. Ball-and-socket component interfaces (i.e. 906:912 and 904:913) are machined to identical dimensions using commercially available matched mill cutter sets, to a tolerance which is on the order of 0.0005 inch. Spring 908 provides a tension of between 17 and 23 pounds-force to initially hold the adjustment of the swivel joint. Screw 909 may be tightened to fully compress spring and lock adjustment in place. The ball joint as embodied allows 20° freedom of motion in any direction from the centerline. Frame 905 is on the order of 3/16 inch thick. Frame 905, ball/socket 912/913 and socket 906 are machined aluminum. Follower 904 may be aluminum or other material as it is not considered part of the thermal transfer path.
Design of the ball-and-socket requires that principles of thermal management well known to those in the art be practiced. The formula TJunction=TA+(Pd)(RthetaJ−A) allows the designer to calculate power dissipation levels where TJunction is junction temperature of the LED, TA is power dissipated by the LED, and RthetaJ−A is thermal resistance between the LED junction and ambient air. Also, modifying the ball-and-socket joint by reducing or increasing contact area will change the thermal resistance of the joint. Heat transfer paste may be used. Further information may be found in the publication from Philips Lumileds Lighting Company “Thermal Design Using Luxeon® Power Light Sources”, as described above.
Ball mount could optionally be configured per
Another apparatus according to aspects of the invention comprises a group or array of LED light sources 901 (which may be mounted to a structure 912, directly to a fixture, etc.) such as 910,
Another apparatus according to aspects of the invention comprises one or more aimable groups or arrays of LED light sources wherein the LED light sources comprise multiple LEDs on a single mounting board. This could be embodied using RGB, RGBA, RGBW LEDs such as the OV4ZRGBA (available from OPTEK Technology Inc., www.optekinc.com). Embodiments using single-board multiple LEDs could appear and function similar to previously described embodiments, with potential advantages in brightness or ability to control color or color temperature.
Another apparatus according to aspects of the invention comprises one or more aimable groups or arrays of LED light sources alone or in a fixture,
Lighting may provide a specified level of illumination based on design calculations or based on informal considerations.
Embodiments of the present invention provide for an apparatus, system, and method for composing a composite light beam, such that the light beam from each optic combination (i.e. the beam produced by light from a light source which is directed by the optic) produces a portion of the overall beam pattern. This beam portion may be the primary or essentially the only light source for a certain portion of the target; alternatively, a series of overlapping beams can be built to a desired pattern by combining a set of these optics that project various beam types (for instance a circular beam type 920,
In order to maintain the intensity within the beam pattern at a desired level of illumination, to compensate for distance (inverse square law) and incident angle (cosine law) or for other factors, multiple optics could “unevenly” contribute light to a particular region of the beam in embodiments of the present invention. For example, more individual beams 925,
The beam edges may overlap the adjoining beam at any desired degree to provide uniform distribution or the entire beam may overlap another beam to increase the intensity, and the composite beam can be composed of a combination of a number of individual beams, either of similar or identical shape, or of different sizes, shapes, distribution angles, and orientations. The result would be a beam distribution, in a rectangle, oblong, oval, circle, fan, or other shape as desired. Additionally, the color temperature and desired color of illumination provided to target areas/objects will be specified.
In accordance with embodiments such as might be used in a park or pedestrian area, such a beam could provide illumination at the base of the light fixture mounting pole as well as to more a further distant areas or objects. The beam could be cut off at the edge of a pedestrian area while still providing adequate illumination close to the edge of the pedestrian area. Or, the beam could illuminate objects such as statues or artwork,
According to embodiments of the present invention, a lighting system is designed to provide a desired illumination level on a target area. The design process entails multiple steps, e.g., two or three separate steps, including analyzing the intended application, selecting individual optics, and designing the composite beam or overall lighting distribution. These steps may be repeated as necessary to optimize the design.
Analyze
Given an area to be illuminated, a determination will be made regarding the size and shape of the intended target area, along with any special areas or objects (such as e.g. statues, signs, artwork, etc.). An illumination level, color temperature, and color is selected which is appropriate to usage.
Illumination available from LED light sources is assigned by methods such as laying out isolumen contours or by dividing the total lumens required for the total area by the number of lumens available from individual light source (taking into account color, reflectivity, texture, etc. of surfaces etc. according to general principles of illumination). This will give a general idea of number and placement of fixtures.
Proposed fixture locations are established in accordance with the amount of illumination desired on given area.
These locations will then be modified, based on requirements for the target area, such as preferred, allowable, and prohibited fixture mounting locations, any required fixture setback from the target area, mounting height, calculations of angle of incidence of the illumination and consideration of the inverse square law of light.
Given these items, using one of several possible methods, the lighting designer will begin designing the light layout to provide desired illumination of the target area.
This will be similar to designing using conventional HID or LED fixtures. However, the designer can plan lighting at a much finer scale since the individual light sources each contribute a small amount to the total light applied to the entire target area.
Additionally, unlike using conventional HID or LED lighting, if there are any areas for which the amount of light should be increased or reduced, this can be accomplished by changing the aiming of a few individual light sources without necessitating a significant reduction or increase in light on adjacent areas.
Select Optic
Light unit configurations, including any optics will be selected to provide the selected beam types. Optics can include refractive, reflective, diffusing holographic, parabolic, paraboloid, or other types. Optics will be specified also according to mounting position relative to the light source such that a given optic and light source may vary as to beam angle or other parameters according to the mounting position of the lens.
If satisfactory individual optics for the given application is already in existence, one or more types may be selected to potentially meet the needs of the application which has been previously analyzed. If not available from previous design, new ones may be designed.
While embodiments of the present invention can be used for creating area lights having patterns as prescribed by the IES types, the pattern from the luminaire is not constrained to the IES types and can be used to custom configure a luminaire for a specific lighting task.
Select Fixture
Light fixtures which use a given number of LED light sources are selected in order to generally provide the calculated illumination levels based on the number of lumens per LED light source, number of light sources per fixture, and location of fixtures. Then the light levels provided by the fixtures can be calculated for the target area to refine type, number, and placement of fixtures
At this point the original design considerations and selection of optics will be re-examined and changes made as necessary to fine-tune the design. This process may be repeated until a desired level of accuracy is achieved.
Manufacture
Some embodiments of the envisioned invention provide or enhance the ability to set or pre-aim a fixture at the factory relative to a particular location or application. The envisioned embodiments may be easily pre-aimed, since their placement of light on an area can be accurately established and indexed to the intended mounting positions of the fixtures. Additionally, the fixtures may be aimed precisely in the field by indexing from individually aimed lights/optics or from precision manufactured reference location on the fixture.
Customized Beam Principles
In accordance with embodiments of the present invention, both standard and customized beam shapes may be designed using well-known optical principles to project a beam of a desired shape and distribution. For example, the fixture as configured with different optics and aiming angles can provide a type 5 lateral beam distribution with long vertical distribution, or a type 2 lateral beam distribution with short vertical distribution, or any other desired beam distributions. Design and construction methods for the optical lens and reflector are well known in the art. Fixtures which are nearly parallel to the ground which are illuminating a distant target have an emittance angle that is ‘flatter’ relative to the fixture, for which reflective optics may be more appropriate, while fixtures which oriented more vertically relative to the ground, or which are illuminating a target that is less distant or that is directly underneath have an emittance angle that is ‘steeper’ relative to the fixture, for which refractive optics may be more appropriate. However, there is considerable overlap between the alternatives and therefore choice of reflective vs. refractive would be made according to the circumstances. Alternatively, for some applications, use of both reflective and refractive optics within the same fixture might be appropriate.
Design of Composite Beam
Thus custom beams may be designed to provide coverage of a given target area. Having analyzed the overall application of the light to the target area, and selected or designed the appropriate individual optics, the designer will lay out each individual optic within each fixture to design the composite beam. In order to design a specific composite beam for a given application and target area, several methods could be used which are known to those of ordinary skill in the art.
For example, a discussion of several methods can be found in Leadford, Kevin F. “Illuminance Calculations—The Lumen Method”, IESNA Lighting Education Intermediate Level ED-150.5A, Illumination Engineering Society of North America, New York, 1993, pp, 5A-1-5A-40 and Lindsey, Jack L. and Serres, Anthony W. “Calculating Illuminance at a Point”, IESNA Lighting Education intermediate Level ED-150.5B, Illumination Engineering Society of North America, New York, 1993, pp, 5B-1-5B-32, incorporated by reference herein.
In some embodiments, light modeling can be used to select the optic design and orientation of the individual light beams to create the composite beam from the fixture. For example, selecting one or more of the beam shapes 925, 926, 927 shown in
Design of Beam by Luminaire Equivalence
Another method of designing a specific composite beam in embodiments of the present invention is calculating the “luminaire equivalence” of each individual optic combination, using existing or custom lighting design software. Using this method, each individual source is considered as a luminaire. The designer can select the optic system based on its photometric properties and place the light from each individual source onto the target area as desired. This process would be repeated until the desired composite beam shape and intensity level was achieved. In one or more embodiments, some level of automation could be added to the design software if desired.
Design of Beam by Standard Layout Tools
Another method of designing a specific composite beam in accordance with embodiments of the present invention is to use standard layout tools such as drafting board, computer-aided design software or other tool to arrange the selected beam shapes to create a composite pattern. For example, if the composite beam pattern desired looked similar to 921,
Design of Beam by Other Methods
Other methods of composite beam design are possible and considered included in this application.
In addition to designing a composite beam based on the use of a single fixture, embodiments of the present invention may use multiple fixtures to target the same or overlapping areas in order to build up intensity to desired levels based on well known principals of lighting. The composite beams from two or more fixtures would be combined as in
An apparatus according to embodiments of the present invention comprises an adjustable light 1000,
The LED can be such as Cree XR-E “star board” LED or equivalent. The flexible joint can be a knuckle joint, having a degree of flexibility of approximately 45° in any direction from its centerline. The joint can include a hollow fastener or coupling which allows power leads 1013 to be routed from the LED to a power source or driver. The flexible joint includes sufficient contact area to allow relatively large amounts of thermal energy to be dissipated to an external heat sink. Alternatively separate thermal couplings such as a separate flexible thermal coupling or heat pipe 930 such as commercially available and known in the art could join the LED source (powered through electrical leads 931) with a heat sink 932,
Another apparatus according to embodiments of the present invention comprises a base 906,
The LED can be such as (such as a Cree XR-E LED available commercially from LED Supply, Randolph, Va., USA, or at http://www.ledsupply.com) or equivalent. The flexible joint can be a ball-and-socket joint, having a degree of flexibility of approximately 20° in any direction from its centerline. The joint can include a hollow fastener or coupling which allows power leads 907 to be routed from the LED to a power source or driver. The flexible joint includes sufficient contact area to allow relatively large amounts of thermal energy to be dissipated to an external heat sink. Alternatively a separate flexible thermal coupling or heat pipe 930 could join the LED source with a heat sink 933,
Optics
Optics such as refractive lenses 917,
Reflectors which could be more or less specular, diffusing, and/or absorbing, could be used. The reflector could be made of various materials depending on application, cost considerations, availability, etc. For example, a reflector could be made of molded plastic with metallized surface, injection molded, machined and polished from aluminum, etc.
Various methods of attaching the reflector to the circuit board, or other structure, are available in embodiments of the present invention. Examples of methods for attaching the reflector include, but are not limited to, mounting as individual pieces above the light sources, or using pins, fasteners or adhesive
Further adjustments could be included as part of the system to allow adjustment in a plane that is not generally parallel to the fixture additionally to that provided by the ball-and-socket mount. For instance, reflectors could be adjusted by ‘tipping’ the reflector relative to the mounting plane, using trunnion-type mounts with e.g. setscrew or gear and sector adjustments.
Additional Features
In accordance with embodiments of the present invention, the individual optic combinations in the fixture can include a mix of different types of lenses.
The flexible mount could include various ball-and-socket designs (e.g.
An embodiment in accordance with some aspects of the invention used with an ‘acorn’ light is illustrated in
An embodiment in accordance with some aspects of the invention used with a ‘globe’ light is illustrated in
An embodiment in accordance with some aspects of the invention used with a ‘lantern’ light is illustrated in
An embodiment in accordance with some aspects of the invention is illustrated in
The components described above are meant to exemplify some types of possibilities. In no way should the aforementioned examples limit the scope of the invention, as they are only exemplary embodiments.
In conclusion, the present invention provides novel systems, methods and arrangements for deriving composite beams from LED lighting. While detailed descriptions of one or more embodiments of the invention have been given above, various alternatives, modifications, and equivalents will be apparent to those skilled in the art without varying from the spirit of the invention. Therefore, the above description should not be taken as limiting the scope of the invention.
An embodiment in accordance with some aspects of the invention provides ‘task lighting’ as discussed in patent application Ser. No. 12/466,640 filed May 15, 2009, issued as U.S. Pat. No. 8,256,921 on Sep. 4, 2012.
Various modifications and additions can be made to the exemplary embodiments discussed without departing from the scope of the present invention. For example, while the embodiments described above refer to particular features, the scope of this invention also includes embodiments having different combinations of features and embodiments that do not include all of the described features. Accordingly, the scope of the present invention is intended to embrace all such alternatives, modifications, and variations thereof.
As can be appreciated, the present invention can take many forms and embodiments. Variations obvious to those skilled in the art are included. The specific embodiments described herein do not limit the invention which is defined solely by the appended claims.
This application claims priority under 35 U.S.C. §119 to provisional application Ser. Nos. 61/226,571 filed Jul. 17, 2009, and 61/320,888 filed Apr. 5, 2010, herein incorporated by reference in their entirety.
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