40 WATT CLEAR CANDELABRA BASE E12 XENON/KRYPTON HALOGEN BULB - TYPE KX40CL/E12 OR KX-2000 - 120 VOLTS - Supra Life tungsten halogen bulbs use a quartz envelope for durability and pure tungsten for longer life. The regeneration cycle continuously restores the filament, creating a 6 times longer burning life and clear crisp white light. Bulborama tungsten lamps are engineered to minimize heat and provide maximum energy efficiency.