Definition of Daylight autonomy and sDA


What does daylight autonomy mean? How do you calculate the same and how is it different from sDA?


Daylight autonomy is the percentage of time that daylight levels are above a specified target illuminance within a physical space or building for a given duration of time. Mean DA is the average of DA values for the entire daylit area.                                             

Spatial Daylight Autonomy (sDA) is a measure of daylight illuminance sufficiency for a given area, reporting a percentage of floor area that exceeds a specified illuminance level (e.g. 300 lux) for a specified amount of annual hours (e.g. 50% of the hours from 8am-6pm).


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