Yes you can if the base is the same however, you shouldn't because the fixture is made for a specific bulb with a specific amount of watts. You should check the fixture and it will tell you the different bulbs that can be used and what wattage for that specific bulb.
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I want to see you plug in a florescent tube into a household incandescent and make it work, I dare you.
Yes. If the socket fits the lightbulb base you can do it. Different lightbulbs have different bases so you don't try to put a DC lightbulb into an AC socket, and go *BOOM*.
yes and it is sometimes a problem
for example cfl / incandescent / mercury / nav-e/i all go to the same socket
but cfl and incandescent work on ac and mercury / nav-e/i burn (and may explode) if connected to ac without special gear
Have you actually tried doing this with different types of light bulbs and the same socket?
(I don't understand the question)
Do you mean mixing incandescent and florescent bulbs? Is there some reason that you couldn't? The house supply can't tell the difference.