New type of reference light source for calibration of luxmeters and photometers

In BelGIM was created the setup for luxmeters and photometers calibration on basis of new type of reference light source. Light source was created on the base of the hemisphere, quartz-halogen lamps and LEDs. Created source provides (at the distance of 500 mm) average value of irradiance within the light spot (65 mm) at least 4000 lx with illumination by LEDs and 3000 lx with illumination by lamps. Uniform illumination within the light spot does not exceed 1 %. The uniform distribution of the correlated color temperature of the radiation within the spot is better than ± 10 K.