The Illuminating Engineering Society (IES) summarizes Daylighting harvesting as the process that takes advantage of available daylight to augment electric lighting systems. Dimming ballasts and photoreceptors can reduce electric lighting loads proportional to the amount of daylight that enters the space. The more usable daylight entering the space, the more the electric lights can be dimmed, resulting in significant energy savings—as much as 60 percent of the connected lighting load to the space.
Another definition, provided by Wikipedia, defines daylight harvesting as; "Daylight Harvesting is the term used in sustainable architecture and the building controls and active daylighting industries for a control system that reduces the use of artificial lighting with electric lamps in building interiors when natural daylight is available, in order to reduce energy.
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