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Incandescent light bulbs are officially banned in the U.S.
(www.digitaljournal.com)
This is a most excellent place for technology news and articles.
I don't know about the energy efficiency, but the life time of the bulb is a variable that they intentionally designed that way. They know how to make an incandescent light bulb that will last indefinitely. The industry colluded with each other to manufacture bulbs that have to be replaced frequently.