Editing Daylighting (architecture) (section)

==Evaluation method==

===Field measurements===
In existing buildings, field measurements can be undertaken to evaluate daylighting performance. [[Illuminance]] measurements on a grid is a basic level to derive an average illuminance of a space. The spacing of the measurement points vary with project purposes. The height of these points depends on where the primary task is performed. In most office spaces, desk level (0.762m above the floor) will be measured. Based on measurements, average illuminance, maximum-to-minimum uniformity ratio, and average-to-minimum uniformity ratio will be calculated and compared to the recommended lighting level.<ref name="Performance Measurement Protocols for Commercial Buildings">{{cite book |date=2010 |title= Performance Measurement Protocols for Commercial Buildings |publisher= American Society of Heating, Refrigerating and Air-Conditioning Engineers, U.S. Green Building Council and The Chartered Institution of Building Services Engineers |isbn= 9781933742793}}</ref>  A diagnostic survey specific to lighting can be conducted to analyse the satisfaction of building occupants.<ref name="Performance Measurement Protocols for Commercial Buildings"/>

===Computational simulations===
Computational simulations can predict daylighting condition of a space much faster and more detailed than hand calculations or scale model testing.  The simulations allow for the effects of climate with hourly weather data from [[typical meteorological year]]. Computer models are available which can predict variations in internally reflected light. [[Radiosity (computer graphics)|Radiosity]] and [[Ray tracing (graphics)|ray-tracing]] are methods can deal with complex geometry, allow complex sky distributions and potentially produce photorealistic images. Radiosity methods assume all surfaces are perfectly diffusing to reduce computational times. Ray-tracing techniques have accuracy and image rendering capacity.<ref name="LG10"/>