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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]
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.
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
"The most sustainable source of lighting is daylight, other forms are solar lamps harvesting daylight and lighting controlled by occupation sensors. Furthermore technologies such as light-emitting diodes can be used to drastically reduce the energy requirement for energy. Part L of the UK lighting regulations contains criteria that effects ...
At the end point (the point of use), a diffuser spreads the light into the room. The first full-scale passive horizontal light pipes were built at the Daylight Lab at Texas A&M University, where the annual daylight performance was thoroughly evaluated in a 360 degree rotating 6 m wide by 10 m deep room. The pipe is coated with a 99.3% specular ...
Lighting control systems typically incorporate the use of time schedules, occupancy control, and photocell control (i.e. daylight harvesting). Some systems also support demand response and will automatically dim or turn off lights to take advantage of utility incentives.
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The lamps are controlled in sections that replicate sky distributions for daylight and Sun-path studies on building scale models on a rotating table. [20] Bartenbach, Tyrol (custom-made artificial sky) - the lighting firm uses a 6.5m diameter artificial sky with 393 lamps for daylighting design with visualization models and calculations. [21]