Light emitting diode (LED) based lighting systems
First Claim
1. A lighting fixture comprising:
- at least one light emitting diode operable to generate and radiate blue excitation light of wavelength 420 nm to 470 nm;
a shade located remotely to the at least one light emitting diode and configured to at least in part surround the at least one light emitting diode to thereby prevent at least in part direct viewing of the at least one light emitting diode, wherein the shade is configured such that excitation light travels in free-space a distance of at least one centimeter from the light emitting diode to the shade; and
at least one phosphor incorporated in a light transmissive flexible sheet and the sheet inserted inside or applied to the shade, wherein the phosphor emits light of a different wavelength in response to incident excitation light, and wherein the combined light from the light emitting diode and the phosphor generate a desired color of light that appears white in color to the eye.
4 Assignments
0 Petitions
Accused Products
Abstract
A lighting system comprises at least one excitation source (5), preferably an LED, operable to generate and radiate excitation radiation of a first wavelength (λ1); a shade (4) configured to at least in part surround the at least one source (5) and remotely located thereto; and at least one phosphor (16) provided in or on at least a part of the shade (4), wherein the phosphor (16) emits radiation of a different wavelength in response to incident excitation radiation. The phosphor can be provided on a part of an outer or inner surface of the shade. Alternatively, or in addition, the phosphor is incorporated within the shade. The lighting system finds particular application as a hanging, a desk, a floor standing, a wall mountable, a spot, an outdoor or an accent lighting fixture.
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Citations
39 Claims
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1. A lighting fixture comprising:
- at least one light emitting diode operable to generate and radiate blue excitation light of wavelength 420 nm to 470 nm;
a shade located remotely to the at least one light emitting diode and configured to at least in part surround the at least one light emitting diode to thereby prevent at least in part direct viewing of the at least one light emitting diode, wherein the shade is configured such that excitation light travels in free-space a distance of at least one centimeter from the light emitting diode to the shade; and
at least one phosphor incorporated in a light transmissive flexible sheet and the sheet inserted inside or applied to the shade, wherein the phosphor emits light of a different wavelength in response to incident excitation light, and wherein the combined light from the light emitting diode and the phosphor generate a desired color of light that appears white in color to the eye. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- at least one light emitting diode operable to generate and radiate blue excitation light of wavelength 420 nm to 470 nm;
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13. A shade for a lighting fixture of a type comprising at least one light emitting diode operable to generate and radiate blue excitation light of wavelength 420 nm to 470 nm;
- the shade being located remotely to the at least one light emitting diode and configured to at least in part surround the at least one light emitting diode to thereby prevent at least in part direct viewing of the at least one light emitting diode, wherein the shade is configured such that excitation light travels in free-space a distance of at least one centimeter from the light emitting diode to the shade and at least one phosphor incorporated in a light transmissive flexible sheet and the sheet inserted inside or applied to the shade, and wherein the combined light from the light emitting diode and phosphor generate a desired color of light that appears white in color to the eye.
- View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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21. A lighting fixture comprising:
- at least one light emitting diode operable to generate and radiate blue excitation light of wavelength 420 to 470 nm;
a shade located remotely to the at least one light emitting diode and configured to at least in part surround the at least one light emitting diode to thereby prevent at least in part direct viewing of the at least one light emitting diode, wherein the shade is configured such that excitation light travels in free-space a distance of at least one centimeter from the light emitting diode to the shade;
at least one phosphor incorporated in a light transmissive flexible sheet and the sheet inserted inside or applied to the shade, wherein the phosphor emits light of a different wavelength in response to incident excitation light; and
a solar cell for generating electrical energy to operate the light emitting diode, and wherein the combined light from the light emitting diode and phosphor generate a desired color of light that appears white in color to the eye. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28)
- at least one light emitting diode operable to generate and radiate blue excitation light of wavelength 420 to 470 nm;
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29. A lighting fixture comprising:
- at least one light emitting diode operable to generate and radiate blue excitation light of wavelength 420 to 470 nm;
a shade located remotely to the at least one light emitting diode and configured to at least in part surround the at least one light emitting diode and located remotely thereto to thereby prevent at least in part direct viewing of the at least one light emitting diode and wherein the shade is configured such that excitation light travels in free-space a distance of at least one centimeter from the light emitting diode to the shade;
at least one phosphor incorporated in a light transmissive flexible sheet and the sheet inserted inside or applied to the shade, wherein the phosphor emits light of a different wavelength in response to incident excitation light; and
a heat sink in thermal communication with the at least one light emitting diode, and wherein the combined light from the light emitting diode and phosphor generate a desired color of light that appears white in color to the eye. - View Dependent Claims (30, 31)
- at least one light emitting diode operable to generate and radiate blue excitation light of wavelength 420 to 470 nm;
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32. A lighting fixture comprising:
- at least one light emitting diode operable to generate and radiate blue excitation light of wavelength 420 nm to 470 nm;
a shade located remotely to the at least one light emitting diode and configured to at least in part surround the at least one light emitting diode to thereby prevent at least in part direct viewing of the at least one light emitting diode wherein the shade has an opening through which light can be emitted directly from the fixture without having to pass through the shade and at least one phosphor provided on at least a part of the shade, wherein the phosphor emits light of a different wavelength in response to incident excitation light, and wherein light emitted from the opening in the shade is of a first color and light emitted through the shade is of a second different color. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39)
- at least one light emitting diode operable to generate and radiate blue excitation light of wavelength 420 nm to 470 nm;
Specification