Lighting systems for providing tunable white light with functional diode emissions

Abstract

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 green color ranges, with each LED string being driven with a separately controllable drive current in order to tune the generated light output. The systems can include an additional LED string configured for functional applications that includes a type of LED selected from 380-420 nm violet saturated LEDs, 200-280 nm UVC saturated LEDs, 850-940 nm near-IR saturated LEDs, 580-620 nm amber-orange/red saturated LEDs, and 460-490 nm long-blue saturated LEDs.

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 green channels respectively, producing first, second, and third unsaturated color points within red, blue, and green 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 falls within a7-step MacAdam ellipse around any point on the black body locus having a correlated color temperature between 1800K and 10000K.   
     
     
         2 - 69 . (canceled)