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United States, a 2001 survey, the night was brightly light pollution has caused the world's 1 / 5 of people turn a blind eye to the Galaxy. One of the authors of the report Elvidge said: "Many people have lost the night sky, night sky lackluster Er Shi is our light." Now there are around 2 / 3 of people living in the light pollution. The night sky away from the outskirts of the city, you can see thousands of stars, but only in big cities to see dozens of pieces. "Light pollution" coming from Light pollution is the problem arising from excessive use of lighting. City lights, advertising signs, neon signs, golf course or baseball field lights, street lamps, lights and even night fishing boats are light sources. Bathed in the light, have you ever thought of those bright lights to our sense of security, will give a fatal impact other species? Most of human history, the term light pollution meaningless. Imagine the moon in 1800 or so marching toward the scene of London: London was the most populous city on Earth, nearly 100 million people live, people relied on candles, torches and lanterns live. Only a few houses with gas lighting. Today, human life in the criss-cross under the light. In many cities, the sky seemed not the stars, the vastness of the original bright stars are disappearing from our memories. United States, "National Geographic" magazine in November 2008 No. Papers that light pollution is mostly the result of poorly designed lighting, artificial light does not need the light to the sky photo, rather than focus on areas that need it down the shine. Poorly designed lighting will dispel the darkness of night, changing the habits of many life forms, light intensity, and even affect some biological migration, breeding and feeding. Do not let the night "withered" 30 years of the 20th century, the international astronomical community first raised the issue of light pollution, light pollution that is caused by urban outdoor lighting on the negative effects of astronomical observations. Britain and America as "false light" in Japanese is called "light pollution." Until now, domestic and light pollution do not have a clear definition of light pollution refers to impact the natural environment, on human normal life, work, rest and recreation adversely affected, damage to people's ability to observe objects, causing discomfort and damage to human health all kinds of light. From 10 nm to 1 mm wavelength ultraviolet, visible and infrared light, under different conditions are likely to be light pollution. In 1988, the International Association for the dark days (IDA) was established in Arizona to promote legislation and public education, encourage the reduction of unnecessary lighting. February 2002, the Czech government on the validity of a street lamp installation requirements, becoming the first national light pollution control laws developed countries. Since then, Midlothian, Virginia, United States District began promoting "national dark days of week" (National Dark-Sky Week), to encourage each April 19 to 26 between the outdoor off unnecessary lights, covered indoor light, so that the sky dark as much as possible so that people have the opportunity to read the Star. May 2003, launched the Royal Astronomical Society "night withered" (Night Blight) procession, encourage the reporting of improper lighting, maintenance of the dark sky. We are high quality suppliers, our products such as China Power Over Ethernet , Fiber Optic Switches for oversee buyer. To know more, please visits Fiber Nic Card.
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