CP Green-i Twilight Photocell Switch will turn lighting on when the ambient light falls below a preset level. The artificial lighting will then be turned off either when the ambient light exceeds the preset level (auto off) or after a preset time delay (timed off). An integral 2 minute time delay prevents nuisance switching caused by car headlights or dark clouds. The unit has a highly accurate adjustable photocell, a selectable time delay, adjustable switching differential and is mounted in a vandal resistant IP66 enclosure.