Which control is used to dim lights when daylight is available?

Which control is used to dim lights when daylight is available?

• A. Dimmable lights
• B. Automatic extinction using PIRs
• C. Photoelectric sensors to dim the light when it's daytime
• D. Lights can be controlled using an automated lighting control system

Answer: (C)

Daylight harvesting relies on sensors that monitor ambient light and adjust artificial lighting to maintain a chosen level while saving energy. A photoelectric sensor detects daylight levels and tells the lighting controller to dim the lights when there is enough natural light. Dimmable lights can be reduced in brightness, but they don’t automatically respond to daylight unless paired with a sensing/control system. PIRs respond to motion, not daylight, and a general automated lighting control system is a broad term that may or may not include daylight sensing. In practical terms, the daylight-sensing photoelectric control directly fulfills the goal of dimming when daylight is available, keeping indoor illuminance consistent while using less electricity.

Daylight harvesting relies on sensors that monitor ambient light and adjust artificial lighting to maintain a chosen level while saving energy. A photoelectric sensor detects daylight levels and tells the lighting controller to dim the lights when there is enough natural light. Dimmable lights can be reduced in brightness, but they don’t automatically respond to daylight unless paired with a sensing/control system. PIRs respond to motion, not daylight, and a general automated lighting control system is a broad term that may or may not include daylight sensing. In practical terms, the daylight-sensing photoelectric control directly fulfills the goal of dimming when daylight is available, keeping indoor illuminance consistent while using less electricity.