http://www.treehugger.com/energy-efficiency/looks-fluorescent-tube-its-actually-41-more-efficient-led-lamp.html
And more about LED
http://www.nytimes.com/2014/01/23/technology/personaltech/review-the-philips-slimstyle-led-lamp.html?nl=technology&emc=edit_ct_20140123
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