CAST Lighting Photocells CTPC (120V) attach to transformers to switch on power at dusk. This is typically used in conjunction with a CAST Timer.
When a CAST Photocell is plugged into your transformer it will turn on at dusk and it will turn off at daybreak. By the addition of a time clock this on/off cycle can be modified, so your lights will always turn on at dusk and turn off at the desired time at night, like 11:00PM.
Installation Guide (PDF)
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