Photo controls feature stem mounting, thermal-type, controls with single and multi-voltage models. Thermal-type photo controls provide dusk-to-dawn lighting control and a delay action, which eliminates loads switching off due to car headlights and lighting. The thermal-type controls feature a cadmium sulphide photocell and a sonic-welded polycarbonate case and lens to seal out moisture. The design utilizes a dual temperature compensating bimetal and composite resistor for reliable long life operation over ambient temperature extremes. Cadmium sulphide photocell. Sonic-welded polycarbonate housing and lens to seal out moisture. Light level slide adjustment. Controls come with a washer gasket and locking nut.