From what I read I think you are only feeding 120V to the eye element.
The neutral or rather the WHITE wire off the photo-eye will have to be connected to one of the phases.. If you have your lights wired between say B&C phases, then connect the photo eye between B&C or whatever you are using..
Better yet, picture it like a standard 120V circuit, where one of the phases is your hot, but the other phase you use is "neutral" even though it isn't and wire it up as if its a regular 120V circuit..
A.D
