Attach And Forget. Our Dusk To Dawn Photocells provide carefree operation, cost savings and life to high lumen parking lot/ area fixtures. The photo controller is applicable to control the street lighting, garden lighting, passage lighting and doorway lighting automatically in accordance with the ambient natural lighting level. This product is equipped with a Metal Oxide Varistor (MOV) to protect both the control and the luminaire against sudden surges in the line voltage. Its quicker response with time delay of 30-45 seconds offers easy-to-test feature.