Patent ID: 8393752

Claim:
A lighting device comprising: a plurality of light sources generating light in different wavelengths, a collimator having a receiving end and an output end wherein said light sources are arranged at said receiving end, and said collimator includes: a first set of wavelength selective filters arranged as sub-collimators to each of said plurality of light sources such that, for each light source, said sub-collimator collimates the light from its light source, and said wavelength selective filter of said each light source is translucent for light from adjacent light sources of different wavelength, wherein said wavelength selective filters are high pass or low pass filters, and a second set of wavelength selective filters including a first and a second compensation filters arranged to compensate for light spread of the collimator; the first compensation filter forming a symmetrical sub-collimator at said receiving end of said collimator over a first light source of the plurality of light sources; the second compensation filter forming a symmetrical sub-collimator at said receiving end of said collimator over a third light source of the plurality of light sources; wherein the first and third light source are adjacent to a second light source; each of said first, second and third light source having different light output wavelengths.