By reducing the supply voltage, HPS street lights can be dimmed. At midnight, when there is little need for light, the power is slowly lowered to reach a low power state. The control devices, like the autotransformer, relays, etc., are usually in the dimming cabinet. And the cabinet connects a stretch of street lights. The reducing process is slow and requires small steps to make sure the light won’t extinguish because of the voltage drop.
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