Why are daylight simulations used in design?

• A. To predict daylight distribution, glare, and lighting energy needs to optimize comfort and energy performance.
• B. To simulate electrical energy consumption of appliances.
• C. To model groundwater flow around the site.
• D. To calculate tax incentives for daylighting.

Answer: (A)

Daylight simulations are used to predict how natural light will fill a space, including how daylight distributes across surfaces, where glare may occur, and how much electric lighting will be required. By modeling the sun’s path, climate data, and the building’s geometry, glazing, interior finishes, and shading strategies, designers can see how different designs affect both comfort and energy use. This allows them to optimize things like window placement, overhangs, louvers, and daylighting controls to maintain good visual comfort (avoiding harsh glare and uneven lighting) while minimizing reliance on artificial lighting, which drives energy performance. The other topics—electrical energy use from appliances, groundwater flow, or tax incentives—cover different areas and aren’t what daylight simulations analyze.