Lighting system
AssigneeU.S. Philips Corporation
InventorsHerbert F. Börner, Wolfgang Busselt, Thomas Jüstel, Hans Nikol, Cornelis R. Ronda, Gerard Harbers
Life of this patent
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Abstract
A lighting system includes at least two light-emitting diodes each emitting, in operation, visible light in a preselected wavelength range. A converter converts part of the visible light emitted by one of the diodes into visible light in a further wavelength range so as to optimize the color rendition of the lighting system. The diodes include a blue light-emitting diode and a red light-emitting diode. Further, the converter includes a luminescent material for converting a portion of the light emitted by the blue light-emitting diode into green light.
Claims20
A lighting system comprising at least two light-emitting diodes, each of said at least two light-emitting diodes emitting, in operation, visible light in a preselected wavelength range, and
- conversion means for converting a part of the visible light emitted by one of the at least two light-emitting diodes into visible light in a further wavelength range so as to optimize the color rendition of the lighting system;
- wherein the at least two light-emitting diodes comprise at least a blue light-emitting diode and at least a red light-emitting diode;
- and
- wherein the conversion means include a luminescent material for converting a portion of the light emitted by the blue light-emitting diode into green light.
A lighting system comprising at least two light-emitting diodes, each of said at least two light-emitting diodes emitting, in operation, visible light in a preselected wavelength range, and
- conversion means for converting a part of the visible light emitted by one of the at least two light-emitting diodes into visible light in a further wavelength range so as to optimize the color rendition of the lighting system;
- wherein the at least two light-emitting diodes at least comprise a blue light-emitting diode and at least a green light-emitting diode, and wherein the conversion means comprise a luminescent material for converting a portion of the light emitted by at least one of the blue and green light-emitting diodes to red light.
A lighting system comprising at least two light-emitting diodes, each of said at least two light-emitting diodes emitting, in operation, visible light in a preselected wavelength range;
- conversion means for converting a part of the visible light emitted by one of the at least two light-emitting diodes into visible light in a further wavelength range so as to optimize the color rendition of the lighting system;
- and
- reflection means.
A lighting system comprising at least two light-emitting diodes, each of said at least two light-emitting diodes emitting, in operation, visible light in a preselected wavelength range;
- conversion means for converting a part of the visible light emitted by one of the at least two light-emitting diodes into visible light in a further wavelength range so as to optimize the color rendition of the lighting system;
- and
- means for separately driving the at least two light-emitting diodes.
Dependencies are inferred from the claim text.