spatial daylight autonomy (sDA)

[10.5.9.9.1]

NOTE: This definition was changed in RP-16-17 Addendum 2. Deletions have a strike-through. New text is bold.

A measure of daylight illuminance sufficiency for a given area, reporting a percentage of floor area that exceeds a specified illuminance (e.g., 300 lux) for a specified percentage of the analysis period.*

An annual daylighting metric that quantifies the fraction of the area within a space for which the daylight autonomy exceeds a specified value. 

*Illuminating Engineering Society. IES Approved Method: Spatial Daylight Autonomy (sDA) and Annual Sunlight Exposure (ASE). New York: IES; 2012. (IES LM-83-12).

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