Patent ID: 6448955
Filing Date: 2002-09-10
Classification: G02B,G02F

Abstract:
A method of selecting light source candidates for an illumination system, said illumination system being white-balance adjustable over a predetermined color temperature range, the method comprising the steps of:(a) varying a percentage composition of red, green and blue phosphors to generate a first set and a second set of light source candidates; (b) from said first set and said second set, selecting a plurality of candidate pairs; (c) calculating combined luminance spectrums for one candidate pair of the plurality of the candidate pairs across various brightness levels of said light sources candidates; (d) from said combined luminance spectrums of said step (c), calculating a color temperature-luminance relationship for said candidate pair; and (e) rejecting said candidate pair unless said color temperature-luminance relationship satisfies a predefined selection criterion.