G8 BASE 20 WATT JCD HALOGEN LIGHT BULB - SHORT VERSION 35 MILLIMETERS LENGTH = 1.37 INCHES - LONG LIFE 3500 HOURS - G8 BIPIN - 130 VOLTS QUARTZ HALOGEN - Supra Life G8 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.