OPTIMIZED SPATIAL POWER DISTRIBUTION FOR SOLID STATE LIGHT FIXTURES
First Claim
1. A method for illuminating a work surface using a solid state lighting fixture, the method comprising:
- generating light from a solid state light source;
introducing the light from the solid state light source into a generally horizontally disposed planar light guide;
reflecting some of the light from a reflector disposed adjacent to a horizontally disposed top surface of the light guide back into the light guide;
introducing the light emitted from a horizontally disposed bottom surface of the light guide into at least one horizontally disposed optical element having a top surface disposed adjacent to the bottom surface of the light guide;
emitting light from the at least one horizontally disposed optical element having a shifted spatial power distribution of light due to the at least one horizontally disposed optical element to more closely approximate a vertical Lambertian spatial power distribution and a horozontal Lambertian spatial power distribution compared to the spatial power distributions of the light without the at least one horizontally disposed optical element, the emitted light from the at least one horizontally disposed optical element comprising a total zonal lumens of at least about 90-percent of the total zonal lumens emitted without the at least one horizontally disposed optical element, and the emitted light is non-polarized and operable to generally accurately reproduce colors of objects; and
illuminating the work surface with the non-polarized light having the shifted spatial power distribution to generally accurately reproduce colors of objects on the work surface.
8 Assignments
0 Petitions
Accused Products
Abstract
In one embodiment, a method for illuminating a work surface using a solid state lighting fixture includes generating light from a solid state light source, introducing the light into a light guide, reflecting some of the light from a reflector back into the light guide, and introducing light emitted from the light guide into at least one optical element. The emitted light from the at least one optical element has a shifted spatial power distribution to more closely approximate a vertical and horizontal Lambertian spatial power distribution, and the emitted light comprises a total zonal lumens of at least about 90-percent of the total zonal lumens emitted without the at least one optical element. The solid state lighting fixture being operable to emit non-polarized light to generally accurately reproduce colors of objects on the work surface.
93 Citations
41 Claims
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1. A method for illuminating a work surface using a solid state lighting fixture, the method comprising:
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generating light from a solid state light source; introducing the light from the solid state light source into a generally horizontally disposed planar light guide; reflecting some of the light from a reflector disposed adjacent to a horizontally disposed top surface of the light guide back into the light guide; introducing the light emitted from a horizontally disposed bottom surface of the light guide into at least one horizontally disposed optical element having a top surface disposed adjacent to the bottom surface of the light guide; emitting light from the at least one horizontally disposed optical element having a shifted spatial power distribution of light due to the at least one horizontally disposed optical element to more closely approximate a vertical Lambertian spatial power distribution and a horozontal Lambertian spatial power distribution compared to the spatial power distributions of the light without the at least one horizontally disposed optical element, the emitted light from the at least one horizontally disposed optical element comprising a total zonal lumens of at least about 90-percent of the total zonal lumens emitted without the at least one horizontally disposed optical element, and the emitted light is non-polarized and operable to generally accurately reproduce colors of objects; and illuminating the work surface with the non-polarized light having the shifted spatial power distribution to generally accurately reproduce colors of objects on the work surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 19)
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14. A method for illuminating a work surface using a solid state lighting fixture, the method comprising:
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generating light from a solid state light source; introducing the light from the solid state light source into a generally horizontally disposed planar light guide; reflecting some of the light from a reflector disposed adjacent to a horizontally disposed top surface of the light guide back into the light guide; introducing the light emitted from the horizontally disposed bottom surface of the light guide into at least one horizontally disposed optical element having a top surface disposed adjacent to the bottom surface of the light guide; emitting light from the at least one horizontally disposed optical element having a shifted spatial power distribution of light due to the at least one horizontally disposed optical element to approximate a vertical Lambertian spatial power distribution and a horozontal Lambertian spatial power distribution, the emitted light from the at least one horizontally disposed optical element comprising a total zonal lumens over the spatial power distribution of at least about 90-percent of the total zonal lumens emitted without the at least one horizontally disposed optical element, the emitted light from the solid state lighting fixture is non-polarized and operable to generally accurately reproduce colors of objects and comprises about 3,500 lumens; illuminating the work surface with the non-polarized light having the shifted spatial power distribution to generally accurately reproduce colors of objects on the work surface; and wherein the light guide, the reflector, and the at least one at least one horizontally disposed optical element comprises at least one of a width and length of about 2 feet by about 2 feet, and a width and length of about 2 feet by about 4 feet. - View Dependent Claims (15, 16, 17, 18)
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20. A solid state lighting fixture for illuminating a work surface, said solid state lighting fixture comprising:
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a solid state light source; a generally horizontally disposed, planar elongated light guide for receiving light from said solid state light source and emitting the light from a generally horizontally disposed first surface of said light guide; a reflector disposed adjacent to a second horizontal surface of the light guide for redirecting some of light from the surface back into the light guide; at least one horizontally disposed optical element having a first surface disposed adjacent to said first surface of said light guide for receiving the light emitted from said light guide and emitting light from a second horizontally disposed surface of said at least one horizontally disposed optical element, said at least one horizontally disposed optical element operable to shift the spatial power distribution of emitted light due to the at least one horizontally disposed optical element to more closely approximate a vertical Lambertian spatial power distribution and a horozontal Lambertian spatial power distribution, the emitted light from said at least one horizontally disposed optical element comprising a total zonal lumens of at least about 90-percent of the total zonal lumens emitted without said at least one horizontally disposed optical element; said solid state lighting fixture being configured to produce non-polarized light to generally accurately reproduce colors of objects; and light emitted from said solid state lighting fixture comprising about 600 lumens to about 6,000 lumens. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 40)
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33. A solid state lighting fixture for illuminating a work surface, said solid state lighting fixture comprising:
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a solid state light source; a generally horizontally disposed, planar elongated light guide for receiving light from said solid state light source and emitting light from a generally horizontally disposed first surface of said light guide; a reflector disposed adjacent to a second horizontal surface of the light guide for redirecting some of the light from the surface back into the light guide; at least one horizontally disposed optical element having a first surface disposed adjacent to said first surface of said light guide for receiving light emitted from said light guide and emitting light from a second horizontally disposed surface of said at least one horizontally disposed optical element, said at least one horizontally disposed optical element operable to shift the spatial power distribution of emitted light due to the at least one horizontally disposed optical element to approximate a vertical Lambertian spatial power distribution and a horozontal Lambertian spatial power distribution, the emitted light from said at least one horizontally disposed optical element comprising a total zonal lumens over the spatial power distribution of at least about 90-percent of the total zonal lumens emitted without said at least one horizontally disposed optical element; said solid state lighting fixture being configured to produce non-polarized light to generally accurately reproduce colors of objects; said light guide and at least optical element comprising a width and length of at least one of about 2 feet by about 2 feet, and about 2 feet by about 4 feet; and the light emitted from said solid state lighting fixture comprising about 3,500 lumens. - View Dependent Claims (34, 35, 36, 37, 38, 39, 41)
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Specification