I realize it's been a while since the original post. But why not use a 3-way switch? Using a standard 3 wire photocell switch, connect the black wire from the light to the common on the 3-way switch. Connect the Red wire from the photocell to one of the 'traveler' connections on the 3-way. Connect a piece of black wire to the other 'traveler' connection on the 3-way switch. Make a 3 wire connection with the black wires from the 3-way, photocell and supply. Make another 3 wire connection with the white wires from the light, photocell and supply. Flip the switch one way and the photocell has control (AUTO). Flip the switch the other way and the light is ON 24/7 (MANuel). Note that the photocell is still active. It just doesn't controll anything.
To also turn the light OFF 24/7, add a Standard switch between the black supply and the other black wires described above. The Standard switch turns the whole thing ON/OFF. The 3-way switch set it for Auto/Manual. Be sure to label the switches as ON/OFF and AUTO/MAN. The ON/OFF switch is ON if the light comes on with the 3-way switch in one or both positions. In daylight, the AUTO/MAN is MAN if the light is ON when the ON/OFF switch is ON.
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