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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 hate to break it to you, but the heating element in the oven uses a magnitude more energy than that little old incandescent light. And the energy otherwise lost from an incandescent light is lost to heat, which just so happens to be the entire purpose of an oven. So in the case of an oven, there's actually no more energy lost than the heat it's already designed to generate.
Besides, have you ever tried putting electronics in an oven? LED's don't exactly like heat ya know...