Patent ID: 7828460

Claim:
A lighting device comprising: a first group of solid state light emitters; a first group of lumiphors; a second group of solid state light emitters; a second group of lumiphors; and a third group of solid state light emitters; wherein: each of said first group of solid state light emitters and each of said second group of solid state light emitters, if illuminated, would emit light having a peak wavelength in the range of from 430 nm to 480 nm; each of said first group of lumiphors and each of said second group of lumiphors, if excited, would emit light having a dominant wavelength in the range of from about 555 nm to about 585 nm; and if each of said first group of solid state light emitters is illuminated and each of said first group of lumiphors is excited, a mixture of light emitted from said first group of solid state light emitters and said first group of lumiphors would, in the absence of any additional light, have a first group mixed illumination corresponding to a first point on a 1931CIE Chromaticity Diagram, said first point having a first correlated color temperature; if each of said second group of solid state light emitters is illuminated and each of said second group of lumiphors is excited, a mixture of light emitted from said second group of solid state light emitters and said second group of lumiphors would, in the absence of any additional light, have a second group mixed illumination corresponding to a second point on a 1931 CIE Chromaticity Diagram, said second point has a second correlated color temperature, said first correlated color temperature differs from said second correlated color temperature by at least 50 K; and each of said third group of solid state light emitters, if illuminated, would emit light having a dominant wavelength in the range of from 600 nm to 630 nm.