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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.
Seems like it's a theft deterrent since they won't work in "normal" sockets?
You need a history expert for this one. I want to say theft deterrent, and possibly different voltages for niche applications. Also Need Flanders Leftorium.