Ushio 120 Line Voltage Halogen Lamps with single ended BA15d double contact Bayonet base, 120 Line Voltage Halogen Lamps with E11 single ended Mini Candelabra base, and 120 Line Voltage Krypton filled Lamps with E11 single ended Mini Candelabra base. Krypton Incandescent lamps run cooler than Halogen lamps.