ceiling cavity ratio (US)

number representative of the geometry of the part of a room between the ceiling and the plane of the luminaires, used in calculation of utilization factor or utilance

Unit: 1

NOTE The ceiling cavity ratio is given by the formula

where *a* and *b* are the dimensions of the sides of the room and *h*_{c} is the distance from the ceiling to the plane of the luminaires. See also "ceiling cavity index", term used outside the US

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