3.2.3 Daylighting

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The Daylighting value will display the Daylight Factor of the selected Surface(s) or Façade(s). Where multiple Surfaces/Façades are selected or where none are selected, the average value is displayed.

Design Daylight Factor is calculated per Unit Floor Area within the Perimeter Zone for each Façade/Surface.  It is a ratio of illuminance indoors on a horizontal work-plane to the horizontal illuminance outdoors under an overcast sky.  It is a good measure for quickly comparing daylight penetration.  Most guidelines recommend a value of 2 – 5% to achieve a ‘cheerfully lit’ condition and to avoid a room being both underlit or glare.

Clicking on a specific Surface will display results for just that surface alone.  The results are graded by colors (grey to yellow) to provide a visual indication of low daylight (grey) to good daylight (yellow).

Daylight Factors can be compared to published guidance for your region.  Guidelines usually recommend that a certain value be achieved for a certain percentage of critical task zones.


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