daylight factor [D]

ratio of the illuminance at a point on a given plane due to the light received directly and indirectly from a sky of assumed or known luminance distribution, to the illuminance on a horizontal plane due to an unobstructed hemisphere of this sky, where the contribution of direct sunlight to both illuminances is excluded

Unit: 1

NOTE 1 Glazing, dirt effects, etc. are included.

NOTE 2 When calculating the lighting of interiors, the contribution of direct sunlight must be considered separately.

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