LEDs last 10x as long as fluorescent bulbs (using 1/3 the energy) and 130x as long as incandescent bulbs. Now they may finally be ready for prime time:
http://www.newscientist.com/article/dn16496-cheap-superefficient-led-lights-on-the-horizon.html?DCMP=OTC-rss&nsref=online-news
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