The Buell X1 Lightning uses a 9003 bulb size for both high beam and low beam headlight applications. The replacement chart covers vehicle production years spanning 1999 to 2002.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 9003 bulb is the sole bulb type specified across all headlight positions for the Buell X1 Lightning, covering model years 1999-2002.
The 9003 is a dual-filament halogen bulb, meaning a single bulb unit contains two separate filaments to serve both high and low beam functions within one housing.
Because the 9003 handles both beam functions, the high beam and low beam headlight positions on the X1 Lightning share an identical bulb specification for all listed model years.
The 9003 operates on a 12-volt electrical system and carries a wattage rating of 60W on the high beam filament and 55W on the low beam filament.
The 9003 uses a P43t base, which is a bayonet-style mount with a 43mm collar. Bulbs with differing base types are not physically interchangeable with this socket.
The 9003 designation follows the ANSI standard recognized in the United States and Canada. It is functionally equivalent to the international HB2 designation, though packaging and labeling may differ by market.