Last Update: March 29, 2010
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Technical Background for Daylighting

Daylighting is more complicated than electric lighting, mainly because of its dynamic nature, which is the result of the continuous apparent movement of the sun and changes in atmospheric conditions. The combination of these changes results in continuous variation of the sky dome luminance distribution with respect to luminous intensity as well as spectral content.

Successful daylighting requires balancing daylight distribution in the space throughout the entire year, i.e., allowing as much daylight as needed for the space type and activities, while minimizing the need for electric lighting and avoiding glare conditions and negative effects on thermal comfort or HVAC loads.

Daylighting Benefits
In addition to providing excellent light quality for visual tasks, daylight offers significant psychological and biological benefits. Moreover, it has the potential to offer significant energy and economic benefits through the application of electric lighting controls that adjust electric lighting based on available daylight.
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Daylighting Challenges
The main challenges of daylighting are its dynamic nature, the adjustment of electric lights for energy savings and the multiple disciplines that are involved in decisions that affect daylighting performance from the initial planning stages to actual occupancy.
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