AmerTac Outdoor Dusk to Dawn Twist Lock Light Control LC120BC-4 is a reliable, certified light control for outdoor applications. It fits dusk to dawn fixtures with NEMA 3 prong receptacles and is ideal for road, parking lot and driveway lighting, with a rated voltage of 120V and wattage of up to 1000W. ETL certified, this control is suitable for use with mercury vapor and sodium bulbs.