Several companies make timers designed to be permanently installed into a circuit. They are usually built into their own steel box and are serious heavy duty units, and have a manual over-ride feature, they are nothing at all like the cheap units designed to turn a table lamp on and off.

It would allow a photocell equipped light to get power only certain hours of the day by setting the 'on' time well ahead of dusk and off at bedtime. I put such a setup on the back of my house to light the dog run. It powers that circuit only between 2pm and 11pm, that way the run is lit between dusk and 11pm everyday, period. This way I don't have to fiddle with the time adjustment to keep the light coming on at the right time as the length of day changes, the time of day when it gets dark changes by more than 5 hours between the winter and summer solstices up here.

Best of luck.

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