A standard incandescent bulb operates at about 260 degrees F. A halogen bulb can reach temperatures of up to 970 degrees F.

If a flammable material comes in contact with a halogen lamp, you're facing a much higher fire risk.

There's a reason some companies and college campuses have banned halogens for safety purposes: http://reslife.tamu.edu/safety/halogen.asp

Halogen also has a higher color temperature than conventional incandescents: http://www.sylvania.com/ConsumerProducts/AutomotiveLighting/...

"White" is not a very precise description of the light emitted by any type of bulb.