FIELD: electrical engineering; change-over systems for incandescent signal lamps used in annunciator panels, traffic lights, and other signaling devices. SUBSTANCE: method involves disconnection of lamp to be turned off from power supply and connection of lamp to be turned on to same power supply by changing state of switching elements; to this end, resistance is varied in lamp to be turned on by preconnecting lamp to be turned off in this circuit. EFFECT: improved reliability due to reduction of in-rush current while turning-on the lamps. 5 dwg
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