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The spectrum of light emitted from a fluorescent lamp is the combination of light directly emitted by the mercury vapor, and light emitted by the phosphorescent coating. The spectral lines from the mercury emission and the phosphorescence effect give a combined spectral distribution of light that is different from those produced by incandescent ...
Screwfix Direct Limited, trading as Screwfix, is a retailer of trade tools, accessories and hardware products based in the United Kingdom. [6] Founded in 1979 as the Woodscrew Supply Company, the company was acquired in July 1999 by Kingfisher plc , which also owns B&Q , and is listed on the London Stock Exchange .
Street light controllers can be expensive in comparison with normal timers, and can cost between $100 and $2,500, but most of them return the investment between 6 months and 2 years. As the equipment's lifetime is 7 to 10 years, it saves energy and cost after the initial investment has been recouped.
A chance discovery led officials in northern England to uncover well over 100 unexploded practice bombs from World War II buried underneath a children's playground.
Light therapy One of the main treatments for winter blues and seasonal affective disorder is light therapy. Researchers at the National Institutes of Health first linked light with seasonal ...
He has sold over 100 million records, 19.5 million of which are albums; [130] he is one of the top 60 best-selling music artists with combined sales of singles and albums. [131] Wonder was the first Motown artist and second African-American musician to win an Academy Award for Best Original Song , which he won for his 1984 hit single " I Just ...
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