Patent ID: 7177033

Claim:
A lighting system control method of controlling a lighting system comprising a plurality of luminescent light sources emitting lights with different colors respectively, an impressed current control mean for controlling impressed currents to said plurality of luminescent light sources, and an input device for inputting instruction values to instruct the luminous intensity for the purpose to generate synthesized lighting with the luminous intensity and preset chromaticity instructed by the instruction values by synthesizing lights emitted from the luminescent light sources, said method comprising: a light source characteristics measuring step of measuring the luminous intensity and chromaticity in relation to a value of the current impressed to each of said plurality of luminescent light sources; a mixing ratio computing step of computing a ratio of intensities of lights emitted from said plurality of luminescent light sources required for synthesizing synthesized lighting with the luminous intensity instructed by said instruction values and the preset chromaticity with the theoretical equation for computing a mixing ratio of intensities of the lights required for synthesizing a synthesized color with the preset chromaticity from a plurality of lights each with the different chromaticity in response to changes in the chromaticity corresponding to changes in luminous intensities of said luminescent light sources measured in said light source characteristics measuring step; a luminous intensity computing step of computing the luminous intensities of said plurality of luminescent light sources for generating the luminous intensity instructed by the instructed value from said mixing ration computed in said mixing ratio computing step; and an impressed current value read-out step of reading said impressed current values required to make said plurality of luminescent light sources emit lights with the luminous intensities computed in said intensity computing step from the characteristics of said plurality of luminescent light sources obtained in said luminescent light source characteristics measuring step.