T3 Candelabra (E12) base 120 volt Krypton/Xenon lamp. Available in clear or frosted. 20, 40 or 60 watt. Bright white light of a halogen. Fully dimmable without performance loss (unlike halogen which can only be dimmed to 60%). Low wattages in line voltage without need for transformer. Energy efficient, long life with average 3000 hours of operation. No UV hazard. Made in Japan.