A halogen bulb has a tungsten filament just like an incandescent light bulb does, but its filament contains halogen gas. An incandescent light bulb burns out when enough tungsten evaporates from the filament, but halogen gas brings these tungsten particles back to the filament, prolonging the life of the bulb.
Outer Shell Bulbs
Some halogen bulbs are placed in an outer shell with a screw-in base, which prevents people from touching the bulb. These are common for outdoor flood lights.
Regular Halogen Bulbs
The other style has two stems at the base of the bulb, which must be placed into the light socket. You should use cotton gloves or a cotton cloth to hold the bulb.
A halogen bulb should not be touched to skin, even when taking it from the package, because the quartz surface can be damaged by skin oils and salt. This causes the bulb to fail rapidly.
If a halogen bulb does come in contact with your skin, you can gently clean the bulb surface with an alcohol-based liquid.
Halogen bulbs burn at much higher temperatures than standard incandescent bulbs do. When the halogen bulb burns out, it's okay to touch it with bare fingers, but you should wait at least 15 minutes for it to cool off to avoid getting burned.