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There's nothing special about hooking up a photocell to a contactor, you just connect the load out from the photocell to the hot of the contactor coil and run the lights through the contactor. All of our lights are on a contactor-controlled photocell.
Does each light have its' own photocell, or do you have one photocell for the entire wash? If just one photocell you likely already have a contactor in your lighting circuit.