MULTI-CHANNEL SYSTEMS FOR PROVIDING TUNABLE LIGHT WITH HIGH COLOR RENDERING AND BIOLOGICAL EFFECTS
The present disclosure provides systems for generating tunable white light. The systems include a plurality of LED strings that generate light with color points that fall within red, blue, and cyan color ranges, with each LED string being driven with a separately controllable drive current in order to tune the generated light output.
1 . A semiconductor light emitting device comprising:
first, second, and third LED strings, with each LED string comprising one or more LEDs having an associated luminophoric medium;
wherein the first, second, and third LED strings together with their associated luminophoric mediums can comprise red, blue, and cyan channels respectively, producing first, second, and third unsaturated color points within red, blue, and cyan regions on the 1931 CIE Chromaticity diagram, respectively;
a control circuit can be configured to adjust a fourth color point of a fourth unsaturated light that results from a combination of the first, second, and third unsaturated light, with the fourth color point fells within a 7-step MacAdam ellipse around any point on the black body locus having a correlated color temperature between 1800K and 10000K.
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