ARRANGEMENT FOR THE CONTROLLABLE SUPPLY OF AT LEAST TWO GROUPS OF ELECTRIC LAMPS

摘要

Apparatus for controlling the energization of at least two groups of lamps each of which is in series with a thyristor wherein the control signal for all thyristors is generated in a common control signal generator. An auxiliary control signal generator is provided for each lamp group to control the lamp energy in the event of a failure of the main control signal.