Claims
- 1. A fluorescent lamp comprising a hermetically sealed tubular glass envelop coated with a phosphor, bases at each end of said tubular glass envelope, electrodes, support electrical leads connected to said electrodes, said electrodes coated with an electron-emission promoting material, and a mercury droplet within said tubular glass envelope; said phosphor having a bi-layer coating comprising a coating of alumina surrounding a coating of silica which surrounds the phosphor.
- 2. The fluorescent lamp according to claim 1 wherein said phosphor is a manganese activated zinc silicate phosphor.
- 3. A high color rendition fluorescent lamp comprising:
- a light transmissive envelope having two ends;
- electrodes sealed into each end of the envelope;
- an arc generating and sustaining medium which includes mercury;
- a first layer of substantially broadband emit phosphor coating an inner surface of the light transmissive envelop; and
- a second layer of phosphor overlying the first layer of phosphor wherein the second layer of phosphor comprises a mixture of red, blue and green emitting phosphors, the green emitting phosphor having a coating of alumina and a coating of silica.
- 4. The high color rendition fluorescent lamp according to claim 3 wherein the green emitting phosphor is a manganese activated zinc silicate phosphor.
- 5. The high color rendition fluorescent lamp according to claim 3 wherein the light transmissive envelop is approximately 96 inches long.
Parent Case Info
This is a divisional of copending application Ser. No. 07/468,632 filed on Jan. 22, 1990 now Pat. No. 5,051,277.
US Referenced Citations (7)