Philips 20-Watt T3 Halogen 12-Volt G4 Capsule Dimmable Light Bulb (2-Pack) 417204 - The Home Depot
20W Halogen Bulbs 20 Watt T3 G4 Base 12 Volt Halogen Light Bulb 20W 12 Volt T3 JC Lamp for Landscape Track Lighting,G4 T3 Bi-Pin Base,Clear,Warm White,Pack of 10 - - Amazon.com