Which of the following is a design consideration for a lighting control strategy in a commercial building?

• A. Remote controlled switches
• B. Use of incandescent bulbs everywhere
• C. No daylight integration
• D. Time controlled switches

Answer: (D)

Designing a lighting control strategy for a commercial building focuses on delivering the right illumination where and when it’s needed while minimizing energy waste. Time controlled switches are a key design feature because they automate on/off schedules that match typical occupancy patterns, so spaces are lit during use and dimmed or dark when unoccupied. This helps curb energy use, reduce operating costs, and supports predictable maintenance and energy budgeting. While remote controlled switches can add flexibility and daylight harvesting can cut consumption further, a solid time-based control provides a reliable baseline and can be used in combination with other strategies. Using incandescent bulbs everywhere is inefficient and defeats the goal of an energy-conscious system, and skipping daylight integration misses a major opportunity to leverage natural light for saving energy.