The automatic lighting control that uses a light level sensor to turn lamps on around dusk and off at dawn is called?

The automatic lighting control that uses a light level sensor to turn lamps on around dusk and off at dawn is called?

• A. Photo control
• B. Time switch
• C. Occupancy sensor
• D. Dusk-to-dawn controller

Answer: (A)

The concept here is sensor-based lighting that responds to ambient light rather than a fixed schedule. A photo control is the device that uses a photocell to sense how much light is present and then switches lamps on when light levels fall (around dusk) and off when light returns (at dawn). This is different from a time switch, which operates strictly by a clock, or an occupancy sensor, which reacts to motion. A dusk-to-dawn controller describes the same function, but the standard device name is photo control because it emphasizes the light-sensing mechanism that drives the switching.

The concept here is sensor-based lighting that responds to ambient light rather than a fixed schedule. A photo control is the device that uses a photocell to sense how much light is present and then switches lamps on when light levels fall (around dusk) and off when light returns (at dawn). This is different from a time switch, which operates strictly by a clock, or an occupancy sensor, which reacts to motion. A dusk-to-dawn controller describes the same function, but the standard device name is photo control because it emphasizes the light-sensing mechanism that drives the switching.