What is the primary purpose of outdoor photo sensors in lighting control?

What is the primary purpose of outdoor photo sensors in lighting control?

• A. Detect motion indoors
• B. Measure humidity
• C. Adjust based on ambient light
• D. Control color temperature

Answer: (D)

Outdoor photo sensors measure the level of ambient light and feed that information to the lighting control system. Their main job is daylight harvesting: when daylight is abundant, they dim or turn off exterior lights to save energy; when daylight fades, they allow the lights to brighten or turn on to maintain the desired level of visibility. This helps keep outdoor areas safely lit while avoiding unnecessary electricity use. They aren’t about detecting motion indoors, measuring humidity, or primarily controlling color temperature—color temperature is handled by separate controls or fixtures rather than the ambient light sensor.

Outdoor photo sensors measure the level of ambient light and feed that information to the lighting control system. Their main job is daylight harvesting: when daylight is abundant, they dim or turn off exterior lights to save energy; when daylight fades, they allow the lights to brighten or turn on to maintain the desired level of visibility. This helps keep outdoor areas safely lit while avoiding unnecessary electricity use. They aren’t about detecting motion indoors, measuring humidity, or primarily controlling color temperature—color temperature is handled by separate controls or fixtures rather than the ambient light sensor.