The Triumph Bonneville SE uses 9003 bulb size for both high beam and low beam headlight applications. Replacement chart data covers 2009 through 2013 model 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 Triumph Bonneville SE uses the 9003 bulb for both high beam and low beam headlight positions across the 2009-2013 model years.
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.
The 9003 operates at 12 volts 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 flange, and fitment requires a bulb with this exact base type to seat correctly in the housing.
The 9003 designation follows the ANSI standard used in the United States and Canada, and it is functionally equivalent to the European H4 bulb, though the two designations reflect different regional certification standards.
Because the same bulb type fills both the high beam and low beam positions on the Bonneville SE, a single replacement bulb addresses both functions, and no separate bulb is required for each beam.