NCIDQ IDFX Practice Exam

What is the approximate daylighting depth based on window height?

1. 1.5 times the height

2. 2 times the height

3. 2.5 times the height

4. 3 times the height

The correct answer is: 2.5 times the height

Daylighting depth refers to how far into a space natural light from a window can effectively reach based on the height of that window. The correct choice indicates that the daylighting depth is approximately 2.5 times the height of the window. This guideline is used in interior design and architecture to ensure that spaces receive adequate natural light and to optimize energy efficiency. The 2.5 times ratio is generally supported by studies on light penetration, which suggest that as you move further from the window, the light diminishes in intensity. This principle is particularly relevant in the design of residential and commercial spaces, where maximizing daylight can enhance comfort and reduce reliance on artificial lighting. The rationale behind this specific measurement allows designers to create spaces that maximize the benefits of natural light, ensuring that the design takes full advantage of the window's height to encourage a bright and welcoming environment while also maintaining a level of energy efficiency.