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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 hc 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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