Which feature best facilitates daylight harvesting by adjusting electric lighting in response to natural light?

Which feature best facilitates daylight harvesting by adjusting electric lighting in response to natural light?

• A. Turn on all lights regardless of daylight
• B. Use manual switches only
• C. Remove daylight sensors
• D. Dimming for windows/rooms facing natural sources of light

Answer: (D)

Daylight harvesting works by sensing how much natural light is already present and then automatically adjusting the artificial lighting to keep a comfortable, consistent level of illumination while using less electricity. The best feature is dimming for rooms that face windows or other natural light sources. When daylight is strong, the dimming system lowers the electric lighting instead of keeping it at full brightness, maintaining visibility and comfort while saving energy. As daylight levels change—due to sun position, weather, or clouds—the lights adjust in tandem, so you get the right amount of light with minimal waste. Turning on all lights regardless of daylight wastes energy, manual switches require user action and don’t respond to daylight automatically, and removing daylight sensors eliminates the automatic adjustment that makes daylight harvesting effective.

Daylight harvesting works by sensing how much natural light is already present and then automatically adjusting the artificial lighting to keep a comfortable, consistent level of illumination while using less electricity. The best feature is dimming for rooms that face windows or other natural light sources. When daylight is strong, the dimming system lowers the electric lighting instead of keeping it at full brightness, maintaining visibility and comfort while saving energy. As daylight levels change—due to sun position, weather, or clouds—the lights adjust in tandem, so you get the right amount of light with minimal waste.

Turning on all lights regardless of daylight wastes energy, manual switches require user action and don’t respond to daylight automatically, and removing daylight sensors eliminates the automatic adjustment that makes daylight harvesting effective.