METHODS AND APPARATUS FOR COLOR MIXING VIA ANGULAR LIGHT OUTPUT MODIFICATION
First Claim
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1. A lighting unit configured to emit a uniform far field light beam, the lighting unit comprising:
- a plurality of LED-based light sources emitting light of different colors, wherein each LED-based light source includes one or more LEDs, and wherein the light emitted by each LED-based light source comprises an angular distribution;
a plurality of optical elements, each of said plurality of optical elements in communication with a respective one of said plurality of LED-based light sources and arranged to modify the light emitted by said LED-based light source;
wherein at least one of said optical elements in communication with a respective LED-based light source emitting light of a given color is configured to modify an angular distribution of the light emitted from the respective LED-based light source such that the modified angular distribution is substantially similar to angular distributions of light emitted by one or more other LED-based light sources of the plurality of LED-based light sources that emit light of one or more colors that are different than the given color.
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Abstract
A method (1000) for far field illumination using modified optical elements that normalize the angular distribution of light of different colors. A lighting unit (400) includes a plurality of light sources (410) emitting light of different colors, where each of the light sources is associated with a respective optical element (470, 480, 490). Each optical element is optimized to modify the angular distribution of light emitted from the light source such that the angular distribution of each of the light sources in the far field is substantially similar.
7 Citations
16 Claims
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1. A lighting unit configured to emit a uniform far field light beam, the lighting unit comprising:
a plurality of LED-based light sources emitting light of different colors, wherein each LED-based light source includes one or more LEDs, and wherein the light emitted by each LED-based light source comprises an angular distribution; a plurality of optical elements, each of said plurality of optical elements in communication with a respective one of said plurality of LED-based light sources and arranged to modify the light emitted by said LED-based light source; wherein at least one of said optical elements in communication with a respective LED-based light source emitting light of a given color is configured to modify an angular distribution of the light emitted from the respective LED-based light source such that the modified angular distribution is substantially similar to angular distributions of light emitted by one or more other LED-based light sources of the plurality of LED-based light sources that emit light of one or more colors that are different than the given color. - View Dependent Claims (2, 3, 4)
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5. A lighting system configured to emit a uniform far field light beam, the lighting system comprising:
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a lighting unit comprising a plurality of LED-based light sources emitting light of different colors, wherein each LED-based light source includes one or more LEDs, and wherein and a plurality of optical elements each in communication with a respective LED-based light source and arranged to modify light emitted by the respective LED-based light source, wherein the light emitted by each LED-based light source comprises an angular distribution; wherein at least one of said plurality of optical elements in communication with a respective LED-based light source emitting light of a given color is configured to modify an angular distribution of the light emitted from the respective LED-based light source such that the modified angular distribution is substantially similar to angular distribution of a light emitted by one or more other LED-based light sources of the plurality of LED-based light sources that emit light of one or more colors that are different than the given color. - View Dependent Claims (6, 7, 8)
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9. A method for far field illumination, the method comprising the steps of:
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providing a lighting unit comprising a plurality of LED-based light sources emitting light of different properties, each of said plurality of LED-based light sources associated with a respective optical element, and each LED-based light source including one or more LEDs, wherein a light beam emitted by each LED-based light source comprises an angular distribution; and normalizing a far field distribution of a light beam emitted by at least one of the plurality of LED-based light sources with far field distributions of one or more light beams emitted by one or more others of the plurality of LED-based light sources; wherein the light beam emitted by the at least one of the plurality of LED-based light sources has a given property that is different than properties of the one or more light beams emitted by the one or more others of the plurality of LED-based light sources. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification