Over-illumination

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This cosmetics store has lighting levels over twice recommended levels[1][verification needed]
Over-illumination is the presence of lighting intensity (illuminance) beyond that required for a specified activity. Over-illumination was commonly ignored between 1950 and 1995,[2] especially in office and retail environments; only since then has the interior design community begun to reconsider this practice.
The concept of over-illumination encompasses two separate but related concerns:
Use of more artificial illumination than required is expensive and energy-intensive. This includes consideration both of the appropriate level of illumination when spaces are in use, and when they are unoccupied.
Some people find excessive levels of artificial light to be irritating. These effects may depend on the spectrum of the light as well as the overall illuminance.
Lighting accounts for roughly 9% of U.S. residential electricity use.[3] Areas where energy and financial savings could be realized include unneeded overnight lighting of office buildings, forsaking available natural light, underutilization of occupancy sensors, and under-using discretionary light controls. In response to these concerns, the design and architecture communities are making greater use of indirect sunlight in modern commercial buildings.
Contents
1 Numerical definition
2 Related phenomena
3 Causes
3.1 Forsaking use of sunlight
3.2 Omitting occupancy sensors
3.3 Failure to delamp or use available lighting controls
4 Health effects
4.1 Headaches, fatigue, stress and performance effects
4.2 Circulatory and circadian rhythm effects
5 Energy and economic considerations
6 See also
7 References
8 External links
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Numerical definition

Some big-box retail stores are over-illuminated.[citation needed]
Generally speaking, over-illumination occurs indoors when light levels exceed 500 lux for incidental lighting, 800 lux for general office use, or 1,600 lux for special purpose use such as microchip etching quality control. For comparison, the midday sun provides about 32,000 to 100,000 lux depending on latitude, time of year and cloud cover. The term over-illumination first came into reasonably broad use in the early 1990s, when the lighting, health and energy conservation fields realized its effects. Production of glare is a de facto indication of over-illumination, since that causes optical processing conflicts and confusion to the brain in processing optical inputs. Over-illumination is sometimes grouped with unnatural spectra because negative health effects may result from the excess illumination, and also because certain artificial lights (such as fluorescent lamps) provide intense illumination in certain frequency bands, unlike daylight, whose spectral power distribution is fairly even over the visible spectrum. The most desirable spectrum is that of natural light, which the body is attuned to and uses to set the circadian rhythms.[4]
Related phenomena
Over-illumination can contribute to light pollution, where stray light illuminates the outdoors or others' property, where it is unwanted. Over-illumination is a topic normally addressed in the process of building design, whereas light pollution is normally addressed by zoning regulations.
Furthermore, over-illumination generally does not refer to the extreme conditions of snowblindness or arc eye, in which ultraviolet light can induce physical damage to the cornea.
Causes
Lighting unoccupied areas is a significant waste of energy. Many office buildings are illuminated overnight and on weekends. In some cases, this is so that janitors working overnight do not have to bother turning lights on and off. Lighting of unoccupied areas can be reduced by installation of occupancy sensors or timers.
Energy can also be wasted by operating outdoor lighting during daylight. In many cases this arises because the lights are controlled by timers, which must be reset periodically as the time of sunset varies throughout the year.
Forsaking use of sunlight

A fitness club that is illuminated mostly by natural light
Forsaking use of sunlight is often a design decision made by the architect or their subcontractor. Overlooking opportunities for skylights is a major defect of many building designs, but lack of coordination of interior light banks with indirect sunlight is an even more common error. At a minimum, the building design should offer sufficient independent light banks so that building occupants may select the most suitable combination of natural to augmented light....(and so on) To get More information , you can visit some products about hid street light, decoration string light, . The Energy Saving Light Bulb Lamp products should be show more here! Over-illumination