| 摘要 |
A stand-by lighting system for a high-pressure metallic-arc lamp circuit is provided which includes an auxiliary light source, a solid state switch for the emergency light, a switch control circuit for operating the switch in response to a predetermined arc lamp circuit condition in which the arc lamp fails to effectively light when normal operating voltage is applied thereto. The control circuit includes a relaxation oscillator for producing triggering pulses for effecting conduction of the solid state switch and energization of the auxiliary light when the above arc lamp circuit condition occurs.
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