This soft white high temperature coated Precision Lighting PFA-100BT15HALSW BT15 halogen light bulb operates at 100 watts and 120 volts. The P.F.A. coating (Teflon) around the bulb is a very unique material that combines extreme temperature resistance with high clarity, excellent adhesion and high impact strength. It has a medium (E26) base and an average life of 3,000 hours. When safety is a concern, shatter resistant light bulbs are the only option.