The U.S. retailing giant, Home Depot, is now selling a super-efficient, LED light bulb for just under $20, and the chain says that the bulbs are selling so quickly that it is having difficulty keeping them in stock. LED bulbs, which emit a brighter light than energy-efficient compact fluorescent bulbs, can last as long as 30 years, which makes their $20 price tag appealing; not long ago,
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