FIELD: electrical engineering. SUBSTANCE: incandescent lamps are connected to power supply where electrical energy is converted into unipolar pulses whose voltage peak value is higher than rated supply voltage of lamps and relative pulse duration is determined by equation 
, where K is relative pulse duration; U1 is peak value of pulse voltage; Ur is rated voltage of lamps. EFFECT: improved efficiency of electric energy utilization, reduced power requirement due to displacement of filament radiation spectrum to visible area. 3 dwg
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