Daylight Calculation
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4. Daylight calculation

Daylight can be handled quantitatively in two ways:

(a) by using luminous quantities (flux, illuminance), i.e., by a set of outdoor conditions and calculating the resulting interior illumiances;

(b) by using relative values (the daylight factor) which compare indoor to outdoor illuminance. For a given position, this factor is constant under widely varying outdoor lighting conditions.