Switch the lights on when there is not sufficient ambient light available, and off when there is sufficient ambient light available. Built-in differential ensures the artificial lights do not affect the photocell. Built-in time delay of 1 minute avoids unnecessary switching. For flush mounting onto false or plasterboard ceilings. Manual wall switch retained for overriding OFF. Flush mounted, hard wired photocell switch Switches on and off automatically Complete with 2m cable for quick and easy installation For lighting energy saving in offices, factories and sports halls