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Light pollution – Wikipedia
This kind of glare is a particular instance of disability glare, called veiling glare. Amenazados por la luz. American cities emit 3—5 times more light to space per capita compared to German cities. The fear is expressed, that when England is lighted from one end to the other with electricity the song birds will die out from the failure of their food supply. July Learn how and when to remove this template message.
Even among developed countries there are large differences in patterns of light use. University of Connecticut Health Center. This page was last edited on 25 Octoberat Singapore was found to be the most light-polluted country in the world.
This is most likely because historically there has not been a contaminavion market specifically for full cutoff fixtures, and because people typically like to see the source of illumination. An alternative calculation starts with the fact that commercial building lighting consumes in excess of Publications of the Astronomical Society of the Pacific. Check out this article to learn more or contact your system administrator.
The Dark-Sky Association was started to reduce the light going up into the sky which reduces visibility of stars see Skyglow below. contaminwcion
Such yellow light sources also have significantly less visual skyglow impact,  so reduce visual sky brightness and improve star visibility for cntaminacion. More presentations by Roberto Sanchez Bernardo Atxaga.
British Journal of Cancer. The costs of installation are expected to be regained through energy savings within six to seven years.
Portland Press Herald, via Washington Post. Timers are especially valuable for this purpose. The usual measures to reduce this glare, if ,uminica the light directly is not an option, include flocking the telescope tube and accessories to reduce reflection, and putting a light shield also usable as a dew shield on the telescope to reduce light entering from angles other than those near the target.
A simple method for estimating the darkness of a location is to look for the Milky Waywhich from truly dark skies appears bright enough to cast a shadow. Beston but efforts to address effects did not begin until the s. Most importantly, public awareness would need to improve for industrialized countries to realize the large payoff in reducing over-illumination.
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Reducing light pollution implies many things, such as reducing sky contaminacikn, reducing glare, reducing light trespass, and reducing clutter. Unfortunately, due to continued lack of accurate information,  many lighting professionals continue to disparage low-pressure sodium, contributing to its decreased acceptance and specification in lighting standards and therefore its use. Learn how and when to remove this template message. Astronomy Picture of the Day.
The indirect lighting method is perceived as more cozy and suits bars, restaurants and living quarters.
La contaminación lumínica en la Península
A newer method for predicting and measuring various aspects of light pollution was described in the journal Lighting Research Technology September Espectros de la luz. For example, lepidopterists and entomologists have documented that nighttime light may interfere with the ability of moths and other nocturnal insects to navigate.
It is most severe in highly industrialized, densely populated areas of North AmericaEuropeand Japan and in major cities in the Middle East and North Africa like Tehran and Cairobut even relatively small amounts of light can be noticed and create problems. Glare light scattering in the eye causes loss of contrast and ljminica to unsafe driving conditions, much like the glare on a dirty windshield from lluminica sunlight or the high beams from an oncoming car.
In addition to skyglow, light trespass can impact observations when artificial light directly enters the tube of the luminiva and is reflected from non-optical surfaces until it eventually reaches the eyepiece.
Please help improve this article by adding citations to reliable sources. There is a significant problem with light pollution ranging from the Canadian Maritime Provinces to the American Southwest. One example of this is found in advertising, when an advertiser wishes for particular lights to be bright and visible, even though others find them annoying.
Studies suggest that light pollution around lakes prevents zooplankton, such as Daphniafrom eating surface algaecausing algal blooms that can kill off the lakes’ plants and lower water quality.
Some species of frogs and salamanders utilize a light-dependent “compass” to orient their migratory behaviour to breeding sites.