ABSTRACT
In Chapter 2 the concept of the daylight factor was introduced. The daylight factor (CDF) expresses the ratio of the illuminance at the point in the room as a percentage of the illuminance from the whole unobstructed sky and is based on the sky being overcast. https://www.w3.org/1998/Math/MathML"> d f = i n d o o r i l l u min a n c e o u t d o o r i l l u min a n c e × 100 % https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781315857916/b16e3d9a-9f0e-4a72-ac2d-dbcba1eee28d/content/math_79_B.tif" xmlns:xlink="https://www.w3.org/1999/xlink"/>
