Higuchi JC 5607 - 20 Watt 6 Volt Halogen Bi-Pin Light Bulb, G4 Base Base: G4, 2 Pin (4 millimeters between pins) 20 Watts, 6 Volts Diameter: 8 millimeters (.31") Length: 30 millimeters (1.18") Life: 2000 Hours