The Honda Motorcycle VTX1800S uses a 9003 bulb size for both high beam and low beam headlight applications. The replacement chart covers vehicle production years spanning 2002 to 2006.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Honda Motorcycle VTX1800S uses the 9003 bulb size across all documented model years, spanning 2002-2006, for both the high beam and low beam headlight positions.
The 9003 is an ANSI-standard bulb designation recognized in the United States and Canada, making it a regionally standardized specification rather than a proprietary or manufacturer-specific size.
The 9003 is a dual-filament halogen bulb, meaning a single bulb contains two separate filaments that serve both the high beam and low beam functions within one housing.
The bulb operates on a 12-volt electrical system and carries a wattage rating of 60W for the high beam filament and 55W for the low beam filament.
The 9003 uses a P43t base, which is a bayonet-style mount with a 43mm collar. This base type determines physical fitment and is not interchangeable with other base configurations regardless of voltage or wattage similarity.
The 9003 designation is functionally equivalent to the H4 bulb used under international ECE standards, though the two designations originate from different regulatory frameworks. Fitment compatibility between them depends on whether the base and housing tolerances align for a specific application.