

They provide standard conditions for daylighting applications (Overcast sky, Intermediate sky, Clear sky, and Uniform sky). The CIE models are essentially simplified and standardised instances of the Perez model.It is also the model LEED requires to be used for daylighting predictions. The Perez model yields accurate results for all sky types from clear to fully overcast.


The Perez sky model is the most used in daylighting simulation applications and the model most analysts use in Radiance.When defining the sky mode, there are several options: Press the ellipsis beside date/time to bring up the environmental settings.
