Editing Daylighting (architecture) (section)

===Quantitative===
A well daylit space needs both adequate lighting levels and light that is well distributed. In the current building industry, daylighting is considered a [[building performance]] measure in green building certification programs such as [[Leadership in Energy and Environmental Design|LEED]]. [[Illuminating Engineering Society]] (IES) and the society of Light and Lighting (SLL) provide illuminance recommendation for each space type. How much daylighting contributes to the recommended lighting level determines daylighting performance of a building. There are two metrics that IES has approved to evaluate daylighting performance:  Spatial Daylight Autonomy(sDA) and Annual Sunlight Exposure (ASE). sDA is a metric describing annual sufficiency of ambient daylight levels in interior environments.<ref name=" LM-83-12">{{cite book | date=2013 |title= Approved Method: IES Spatial Daylight Autonomy (sDA) and Annual Sunlight Exposure (ASE) |publisher= Illumination Engineering Society |isbn=9780879952723}}</ref> See Daylight autonomy and LEED documentation sections for more details.