- Aug 3, 2009
It matters because a halogen is smaller. Want to make tight bends in the waist or a cutaway? Good luck doing that around a pipe that will hold a 100 watt incandescent bulb.For purposes of heating the inside of a metal tube I don't think it matters much which kind of bulb you use. The bulb is simply functioning as a resistive heating element, and whether the electrical power going to the bulb or element is making heat or light, the tube should heat up the same for a given watt input. The surface of a halogen bulb is hotter than a similarly power rated incandescent because it's radiating its heat over a much smaller area.