USALight.com offers a wide selection of 12 Volt Halogen and 12 Volt LED replacement bulbs.
Part Number: LBAY-3W-WWNon-DimmableWattage - 3w (25W Equivalent)Voltage - 12-25vColor Temp - 3000KLumens - 290lmBase - BA15SAverage life: 25,000 Hours.
Part Number: Orbit LBAY-CWNon-DimmableWattage - 1.6w (20W Equivalent)Voltage - 12-25vColor Temp - 4100KLumens - 200lmBase - BA15SCool White, RoHS compliant.
Part Number: 40165Description Part Number: 12.8V 1.8A S-8 SCWattage - 21w Voltage - 12v Base: Single Contact Bayonet (BA15s)Filament - C-6Length: 2" (50.8mm) Diameter: 1.05" (26.4mm)