aquabanana wrote:..would a red heat bulb or hallogen bulb be a cheap alternative for UVB?
Unfortunately no. The the red heat bulbs and halogen bulbs are meant for heat. They do not put out the appropriate light wavelengths of the UVB range needed for turtles.
A standard incandescent light bulb can serve as a cheap substitute for a heat lamp. There really is no cheap substitute for a proper UVB bulb.
If you shop around (internet) you can pick up a CFL twisty Repti Glo UVB 5.0 bulb for $12-15. They don't put out much heat so you can stuff it in pretty much any ol' lamp with the proper wattage rating.
My suggestion would be to save a few bucks on the light fixture and buy an el-cheapo clamp light from your local home improvement / hardware store and spend a couple of extra bucks on the proper UVB bulb.