Electrical fire?

Can a HID below 100 watts be used in a regular ceramic cased light socket?

I would NEVER try this, as no matter what the wattage it specifically says use only in HPS supported fixtures, I think i know someone who burned down his house like this but i have no idea what wattage he was using.
but anyway i would like to know if anyone has ever tried it, one of the reasons ive had to be a CFL grower is the expensive ballasts and high wattage electrical bills.

I don't think so, I think they all require a ballast.

No you need a ballast and my electric bill only about 10-15 more for HID 400 watt grow well worth the smoke that it yields