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The useful daylight illuminance calculation is based on three factors—the percentage of time a point is below, between, or above an illuminance value. The range for these factors is typically 100–2,000 lux. Useful daylight illuminance is similar to daylight autonomy but has the added benefit of addressing glare and thermal discomfort. [44]
Daylighting (architecture), use of windows for indirect lighting; Daylighting (intersections), improving road visibility at intersections; Daylighting (streams), restoration of a previously buried watercourse; Daylighting (tunnels), opening a transportation tunnel
Daylight is the combination of all direct and indirect sunlight during the daytime. This includes direct sunlight , diffuse sky radiation , and (often) both of these reflected by Earth and terrestrial objects, like landforms and buildings.
Kimbell Art Museum interior with daylight control and electric lighting design by Richard Kelly (1969) Architectural lighting designer is a stand-alone profession that sits alongside the professions of architecture, interior design, landscape architecture and electrical engineering. [23]
Daylight harvesting systems use daylight to offset the amount of electric lighting needed to properly light a space, in order to reduce energy consumption. This is accomplished using lighting control systems that are able to dim or switch electric lighting in response to changing daylight availability.
In architecture, a daylight factor (DF) [1] is the ratio of the light level inside a structure to the light level outside the structure. It is defined as:
A light shelf is a horizontal surface that reflects daylight deep into a building. Light shelves are placed above eye-level and have high-reflectance upper surfaces, which reflect daylight onto the ceiling and deeper into the space. Light shelves are typically used in high-rise and low-rise office buildings, as well as institutional buildings.
Yonkers, New York, the third largest city in the state, broke ground on December 15, 2010, on a project to daylight of the Saw Mill River as it runs through its downtown, called Getty Square. The daylighting project is the cornerstone of a large redevelopment effort in the downtown. [ 39 ]