room index [*K*]

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

Unit: 1

Equivalent term: "installation index"

NOTE The room index is given by the formula

where *a* and *b* are the dimensions of the sides of the room and *h* the mounting height, that is the distance between the working plane and the plane of the luminaires.

See also US term "room cavity ratio"

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