J.LUMI YCA1030 Through-hole mount dusk-to-dawn photo control ideal for residential outside post light control and able to be mounted into standard outlet box, post lamp pole and wall pack fixtures. Thermal sensor eliminates the load temporarily switching off due to car headlights, lightning or another temporary light source. Locking nut and washer gasket help keep moisture from penetrating photo control device. Requires a minimum 5/8 In. through-hole for proper mounting and wires should mount down when properly installed.