Easily transform your exterior lights to come on at dusk and off at dawn. Simply screw this control into any medium base socket and then screw your incandescent or compact fluorescent bulb into the control. Rated for up to 150 Watts with the socket facing up and up to 100 Watts with the socket facing down. Do not use this control with another light control or dimmer in the same circuit. Use only with clear glass as the sensor will not work through opaque or frosted glass.