Patent ID: 8651723

Claim:
An LED light source emitting white light, the light source comprising: a transparent bulb; at least one first LED emitting light in a first spectrum comprising near UV spectrum; at least one second LED for emitting light in a second spectrum different from the first spectrum, at least one controller coupled to the at least one first LED and the at least one second LED and configured to selectively and independently control intensity of the light emitted thereby so as to controllably vary one or more attributes of total light generated by the light source, and a luminescent layer disposed on the surface of the bulb and for being irradiated by the at least one first LED emitting and the at least one second LED, the luminescent layer comprises a red emitting luminescent material, wherein the at least one first LED, the at least one second LED, the at least one controller and the luminescent layer are constrained to implement a red shift of said white light when the light source is dimmed.