The Buell XB9S Lightning uses H7 bulb size for both high beam and low beam headlight applications. The replacement chart covers 2003 to 2004 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 H7 is a single-filament halogen bulb operating at 12 volts and 55 watts, fitted with a PX26d base. The single-filament design means one bulb serves one lighting function, which is why the Buell XB9S Lightning uses separate H7 bulbs for its high beam and low beam circuits.
The H7 bulb follows the ECE (Economic Commission for Europe) standard, giving it approval for use across Europe, worldwide markets, the United States, and Japan. This broad regulatory acceptance reflects its status as one of the most widely adopted halogen bulb formats in automotive and motorcycle lighting.
The PX26d base is a bayonet-style connector specific to H7 bulbs. It is not interchangeable with other common halogen bases such as H4 or H11, meaning substitution with physically similar-looking bulbs of a different type would result in an incompatible fit.
The Buell XB9S Lightning uses the H7 bulb for both the high beam and low beam headlight positions across the 2003-2004 model years. Although both positions share the same bulb type, they remain separate installations within the headlight assembly.