FIELD: biology. SUBSTANCE: device has a pulsed semiconductor radiator, transformer voltage converter, threshold feedback signal forming circuit, a power supply system. Upon increasing a load as a result of switching on the pulsed semiconductor radiator a frequency of the transformer voltage converter increases due to a frequency-dependent feedback signal from the output of the threshold feedback signal forming circuit. Thus, by the next moment of switching on the pulsed semiconductor radiator parameters of the power supply system have constant values resulting in stability of a light flux from the radiator. EFFECT: enhanced stability. 2 cl, 1 dwg
