the use of natural light from outside to replace or supplement electrical light indoors, which produces energy savings.

Daylighting may be specified for any of the perimeter zones. When daylighting is modeled, the ceiling is assumed to have a reflectance of 80%, walls 60% and floors 20%.If interior shade is specified, windows are assumed to have a medium colored venetian blind that is closed when solar gain exceeds 30 Btu/h-ft������².When the blind is closed, the visible light transmission of the glazing is assumed to be reduced to 60% of the light transmission of the window with the blind open. The reference point for daylighting calculations is assumed to be located in the center of the daylit zone.

The means by which daylight is brought into a building to either supplement or replace electrical lighting in order to allow the occupants to perform their tasks.

returning streams from underground pipes to the open air, where sunlight can activate the microbial communities, providing sustainable water quality benefits.

surface mining of underground mines

In urban design and urban planning, daylighting is the redirection of a stream into an above-ground channel. Typically, the goal is to restore a stream of water to a more natural state. Daylighting is intended to improve the riparian environment for a stream which had been previously diverted into a culvert, pipe, or a drainage system.