Engineered to meet EISA lighting-efficiency requirements, LITE PAR Eco™ Lamps include PAR20 model in 39 W; PAR30 models in choice of 39 or 60 W, with Long Neck models in same wattages;
[source: http://news.thomasnet.com/fullstory/Halogen-Lamps-provide-1-500-hour-rated-life-20015570]
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