Patent ID: 8517550
Filing Date: 2013-08-27
Classification: F21K,F21S,F21V,F21Y,H01L,H05B

Abstract:
1. A solid state lighting device for variable color lighting, comprising: a first solid state source configured to emit electromagnetic energy in a predetermined spectrum; a first optical element arranged to receive electromagnetic energy from the first solid state source; a first phosphor in the first optical element at a location for excitation by the electromagnetic energy received from the first solid state source, the first phosphor being of a type excitable by electromagnetic energy of the predetermined spectrum and when excited for emitting visible light of a first color that is at least substantially pure; a second solid state source configured to emit electromagnetic energy in said predetermined spectrum; a second optical element arranged to receive electromagnetic energy from the second solid state source but to receive little or no electromagnetic energy from the first solid state source, wherein the first optical element is arranged to receive little or no electromagnetic energy from the second solid state source; a second phosphor in the second optical element at a location for excitation by the electromagnetic energy received from the second solid state source, the second phosphor being of a type excitable by electromagnetic energy of the predetermined spectrum and when excited for emitting visible light of a second color that is at least substantially pure, the second color being different from the first color, wherein: when the phosphors are excited, a visible light output of the lighting device includes a combination of first and second color lights emitted by the first and second phosphors, from the first and second optical elements, and color of the visible light output of the lighting device is adjustable in response to adjustment of respective intensities of the electromagnetic energy emitted by the first and second solid state sources to adjust relative levels of excitations of the first and second phosphors.