Discussion
The daylight factor at a point indoors is the ratio of the indoor illuminance to the
Answer: C
Correct answer: simultaneous outdoor illuminance under an unobstructed sky
The daylight factor is a ratio taken at the same moment, so it is a property of the room’s geometry and glazing rather than of the weather. That is what makes it usable in design: it can be computed once and applied to any sky condition, and a figure of two per cent is a common minimum for a working space.
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