How can daylighting strategies be integrated with LED lighting to optimize energy efficiency and visual comfort?

• A. Rely solely on artificial lighting, ignoring daylight.
• B. Use daylight sensors to dim or switch LEDs, select appropriate CCT and CRI for tasks, balance glare with shading, and integrate skylights/windows.
• C. Use daylighting only in exterior spaces.
• D. Ignore glare and shading.

Answer: (B)

The concept being tested is coordinating daylight with electric lighting to cut energy use while keeping people comfortable. Using daylight sensors to dim or switch LEDs lets the lighting system automatically reduce artificial light when sunlight is enough, and raise it when daylight falls short, maintaining a desired illuminance without waste. Selecting LED lighting with appropriate CCT and CRI supports both task performance and comfort; a neutral to cool CCT can boost alertness for work tasks, while a high CRI helps colors appear accurately, complementing daylight rather than fighting it. Controlling glare with shading devices or dynamic shading ensures daylight improves visibility without causing harsh contrasts or screen reflections. Integrating skylights and windows effectively harvests daylight across the space, reducing the need for artificial lighting and distributing light more evenly.