NCIDQ IDFX Practice Exam

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What does the daylight factor express?

The total light during sunny days
The ratio of indoor to unobstructed outdoor illuminance
The brightness of artificial lighting
The percentage of light blocked by windows

The correct answer is: The ratio of indoor to unobstructed outdoor illuminance

The daylight factor represents the ratio of indoor illuminance to unobstructed outdoor illuminance under overcast sky conditions. It is a crucial metric in the field of interior design and architecture, as it provides insights into how much natural light is reaching the interior spaces of a building. This factor helps designers assess natural lighting conditions in relation to the amount of daylight that enters a space, which can impact occupant comfort, energy efficiency, and overall design quality. Understanding the daylight factor is essential for making informed decisions about window placement, building orientation, and interior layouts to maximize natural light while minimizing reliance on artificial lighting. This metric is particularly important in sustainable design practices, where the goal is to create environments that are not only aesthetically pleasing but also energy-efficient and conducive to well-being.