The Buell 1125R uses an H8 bulb size for both high beam and low beam headlight applications. Replacement chart data covers 2008 to 2010 vehicle 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 H8 is a single-filament halogen bulb operating at 12 volts and 35 watts, fitted with a PGJ19-1 base, and rated under the ECE standard used in Europe and internationally, with approval also recognized in the United States.
The Buell 1125R uses the H8 bulb for both high beam and low beam headlight positions across the 2008-2010 model years.
Because the high beam and low beam positions share the same H8 specification, both functions rely on separate single-filament bulbs rather than a dual-filament unit handling both beams.
The PGJ19-1 base is a keyed locating base type, meaning physical fitment is restricted to sockets designed specifically for that base configuration, and bulbs with differing base types are not interchangeable regardless of wattage or voltage similarity.
At 35 watts, the H8 sits at a lower wattage than related halogen types in the H-series family, such as the 55-watt H11, which shares the same PGJ19-1 base but is not a drop-in substitute due to the wattage and certification differences.