FIELD: physics.
SUBSTANCE: system has apparatus for controlling LED light sources in accordance with a difference between first set values representing a desired light output and first control data provided by at least one optical sensor which is sensitive to a property of the light produced by the LED light sources, apparatus for compensating said first set values in accordance with second control data provided by a temperature sensor which is sensitive to the temperature of said optical sensor(s), and apparatus for calculating temperature of each LED light source and temperature of said optical sensors from radiator temperature measured by a temperature sensor connected to the radiator accommodating said LED light sources and optical sensors. LED light sources are controlled in accordance with second set values represented by the desired mixed colour output. The calculated temperature values of LED light sources are included in said second control data, and said second set values are compensated for in accordance with said calculated temperature values of LED light sources.
EFFECT: high colour stability.
3 cl, 3 dwg
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