Granted Patent B2

US 7,635,203 · App. 10/555,913 · Granted Dec 22, 2009

Abstract

Claims (57)

1. A lighting apparatus comprising:

a light engine for producing an ultra violet radiation comprised of

LEDs disposed on a circuit board to emit the ultra violet radiation

wherein a mounting surface of the printed circuit board is reflective of the UV radiation; and

an enclosure surrounding a radiation generating area of the light engine to at least substantially encompass the radiation, the enclosure includes:

a first portion which is substantially reflective of the ultra violet radiation, and

at least one second portion which includes a phosphor portion, the second portion being spaced from the radiation generating area of the light engine, the phosphor portion includes:

a radiation receiving surface and a light emitting surface to render visible light.

2. The apparatus as set forth in claim 1 , wherein the light engine includes:

a heatsink disposed on a side of the circuit board opposed to the LEDs to dissipate heat generated by the LEDs.

3. The apparatus as set forth in claim 2 , wherein the LEDs have a wavelength equal to or less than 510 nm.

4. The apparatus as set forth in claim 2 , wherein the heatsink includes a plurality of wings.

5. The apparatus as set forth in claim 1 , wherein the enclosure has a shape of an incandescent bulb.

6. The apparatus as set forth in claim 1 , wherein the phosphor portion is created by dispersing a phosphor powder within the at least one second portion of the enclosure.

7. The apparatus as set forth in claim 1 , wherein the phosphor portion is a generally planar body including:

a substantially uniform internal layer of a phosphor material.

8. The apparatus as set forth in claim 1 , wherein the phosphor portion includes:

a first reflective coating disposed about a radiation receiving surface, which is transmissive to wavelengths of the ultraviolet radiation and reflective to wavelengths of light emitted by phosphor existing in the phosphor portion.

9. The apparatus as set forth in claim 1 , wherein the phosphor portion includes:

a second reflective coating disposed about a light emitting surface, which second coating is reflective to the ultraviolet radiation and transmissive to wavelengths of light emitted by phosphor existing in the phosphor portion.

10. The apparatus as set forth in claim 1 , wherein the enclosure includes:

sides; and

a removable top panel, which includes the phosphor portion.

11. The apparatus as set forth in claim 10 , wherein the phosphor portion includes:

a tri-color red-green-blue phosphor with color temperatures from 2500 to 10000 K and color rendering indicies from 50 to 99 for producing an uniform visible light.

12. The apparatus as set forth in claim 10 , wherein an interior surface of the sides is a reflective material which is substantially reflective to ultra violet radiation and wavelengths of light emitted by the phosphor.

13. The apparatus as set forth in claim 12 , wherein an interior surface of the sides is coated with a reflective material, which is substantially reflective to ultra violet radiation and wavelengths of light emitted by the phosphor.

14. The apparatus as set forth in claim 10 , further including:

a plurality of replaceable removable top panels, wherein phosphor mix and concentration is predetermined for each phosphor portion of each top panel such that the lighting system produces multiple preselected visible light colors by interchanging the top panels.

15. A lighting system comprising:

a light engine having a direction of primary radiation emission and including:

a PC board,

a plurality of UV LEDs disposed on the PC board, and

a heat sink disposed on a side of the PC board opposed to the LEDs; and

an enclosure surrounding the direction of radiation emission and including:

at least one portion which substantially reflects UV radiation, and

a phosphor containing portion generally opposite and spaced from the light engine, the phosphor containing portion including:

a visible light reflecting layer on a first side of the phosphor facing the light engine and a UV light reflecting layer on a second side of the phosphor away from the light engine.

16. A lighting apparatus comprising:

a light engine for producing an ultra violet radiation; and

an enclosure surrounding a radiation generating area of the light engine to at least substantially encompass the radiation, the enclosure including:

a first portion which is substantially reflective of the ultra violet radiation, and

at least one second portion which includes a phosphor portion, the second portion being spaced from the radiation generating area of the light engine, the phosphor portion comprising:

a radiation receiving surface and a light emitting surface to render visible light; and

a first reflective coating disposed about the radiation receiving surface, which is transmissive to wavelengths of the ultraviolet radiation and reflective to wavelengths of light emitted by phosphor existing in the phosphor portion.

17. A lighting apparatus comprising:

a light engine for producing an ultra violet radiation; and

an enclosure surrounding a radiation generating area of the light engine to at least substantially encompass the radiation, the enclosure including:

a first portion which is substantially reflective of the ultra violet radiation, and

at least one top portion which includes a phosphor portion, the top portion being spaced from the radiation generating area of the light engine, the phosphor portion comprising a radiation receiving surface and a light emitting surface to render uniform

visible light, and a tri-color red-green-blue phosphor with color temperatures from 2500 to 10000 K and color rendering indicies from 50 to 99 for producing the uniform visible light.

18. A lighting apparatus comprising:

a light engine for producing an ultra violet radiation;

an enclosure surrounding a radiation generating area of the light engine to at least substantially encompass the radiation, the enclosure including:

a side portion which is substantially reflective of the ultra violet radiation, and

a plurality of replaceable removable top panels which include a phosphor portion, the top panel being spaced from the radiation generating area of the light engine, the phosphor portion including:

a radiation receiving surface and a light emitting surface to render visible light and a phosphor having a mix and concentration predetermined for each phosphor portion of each top panel such that the lighting system produces multiple preselected visible light colors by interchanging the top panels.

Assignments (8)