Patent ID: 8388175
Filing Date: 2013-03-05
Classification: G02B

Abstract:
1. A lighting device comprising: a plurality of light sources providing light in different wavelengths, a collimator having a receiving end and an output end, said light sources being arranged at said receiving end, said collimator comprising: a first set of wavelength selective filters arranged as sub-collimators corresponding to each of said plurality of light sources such that, for each light source, said corresponding sub-collimator collimates the light therefrom, and said wavelength selective filter of said each light source is at least translucent for light from adjacent light sources of different wavelength; and a second set of wavelength selective filters comprising compensation filters wherein said compensation filters are arranged symmetrically with respect to corresponding part of the wavelength selective filter of said first set around a general light direction of the corresponding light source; said compensating filters forming discontinuous wavelength selective filters in said second set of wavelength selective filters from said receiving end of said collimator to said output end.