[10.3.1.3]
A classification parameter for indoor luminaires relating to the distribution of the direct-illuminance component produced on the work plane. The spacing criterion of a luminaire is an estimated maximum ratio of the luminaire spacing to the luminaire mounting height above the work plane for a regular array of that luminaire such that the work plane illuminance will be acceptably uniform.
Note: SC in 0-degree and 90-deg horizontal directions can be different.
NOTE: This definition was changed in ANSI/IES RP-16-17 Addendum 4.
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