Philips Q20/G4/CL/12V, 20 Watt, T3 JC Type, 12 Volt, Clear, G4 Bi-pin Base, Halogen Light Bulb,Pack of 10 Set of 10, jc type G4 halogen bulb 12V 20W Long life: approx. 2,000 hours bulb life Base: G4 Bi-Pin Base (4 Millimeters between Pins) Halogen light bulbs have a longer life and a higher light output than incandescent bulbs Halogen bulbs have a whiter and brighter light and less blackening, dimmable with most dimmers