The Buell XB12R Firebolt uses H3 bulb size for both high beam and low beam headlight applications. The replacement chart covers 2004 through 2010 production years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Buell XB12R Firebolt uses the H3 bulb type for both its high beam and low beam headlight positions across the 2004-2010 model years.
The H3 is a single-filament halogen bulb, meaning one filament handles one lighting function, which is why separate H3 units are required for the high beam and low beam circuits rather than a single dual-function bulb.
The H3 operates at 12 volts and 55 watts, placing it within the standard halogen output range typical of motorcycle headlight applications.
The H3 bulb uses a PK22s base, a pinch-type connector that differs from the bayonet or wedge bases found on other common automotive bulb types, making it non-interchangeable with those formats.
The H3 is an ECE-rated bulb, a designation indicating compliance with the Economic Commission for Europe lighting standard, and it also carries approval for use in the United States and Japan.
Because the same H3 specification applies to both the high beam and low beam positions, the physical bulb used in each socket is identical, though the two positions remain electrically separate circuits.