FIELD: physics.
SUBSTANCE: illumination device has a plurality of sources which emit light with different wavelengths and a collimating means. The collimating means has a receiving end and an output end, wherein said light sources are placed at said receiving end. The collimating means has a first set of wavelength selective filters that are arranged as auxiliary collimators for each of said plurality of light sources, and a second set of wavelength selective filters, having at least two compensating filters arranged to adjust light scattered by the collimating means. For each light source, said auxiliary collimator collimates light from its light source and said wavelength selective filter of said each light source transmits light from neighbouring light sources with another wavelength. Said wavelength selective filters are high-pass and low-pass filters.
EFFECT: reduced colour change.
15 cl, 7 dwg
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