My Homemade Low Voltage Photocell

This one I made has a photocell circuit module, that I brought from eBay, and I put a cadmium sulfide photo resistor, and tape it right on the door. The input only from this unit is only 12VDC, the output, you can put any voltage you want, cause its contacted by the relay. But its going to need waterproofing material for to be put outside. In order to put the output voltage, its like a switch basically, so it has to be on one side of the output voltage you want, and the other goes to the light.