The Importance of Daylighting in a Building

The two primary reasons for using daylight to meet the illumination requirements of an architectural space are the psychological benefits and the energy savings benefits.

 Good daylighting has been shown to improve the overall attitude, satisfaction and well being of building occupants. A number of research studies, a few of which are listed below, have shown a variety of benefits of daylighting in different building types and functions, among them improved retail sales in big box stores, increased worker productivity and reduced absenteeism in office buildings, improved student educational performance in K–12 schools, and improved patient recovery times in hospitals. Exposure to daylight has also been shown to improve general health and circadian rhythm. These psychological benefits can easily justify any extra design effort or added expense associated with introducing controlled daylight into buildings.

Daylighting, with proper electric lighting controls, can result in significant energy savings by reducing electric lighting loads and associated cooling loads. In addition, with proper solar control, solar gains during cooling load periods can be mitigated and solar gains during heating load periods can be utilized, reducing the energy requirements of both cooling and heating a space.


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