Honda Motorcycle VTX1800F headlight bulbs use 9003 size for both high and low beam functions. The replacement chart covers 2005 to 2008 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 Honda Motorcycle VTX1800F uses the 9003 bulb for both its high beam and low beam headlight positions across the 2005-2008 model years.
The 9003 is an ANSI-standard halogen bulb recognized in the United States and Canada, operating on a 12-volt electrical system with a dual-filament design rated at 60 watts for high beam and 55 watts for low beam.
Because a single 9003 bulb serves both the high beam and low beam functions, the two filaments within one housing handle both lighting modes rather than requiring separate bulbs for each position.
The 9003 uses a P43t base, which is a bayonet-style mount with a 43mm collar. This base type determines physical fitment into the headlight housing and is not interchangeable with other base configurations.
The shared bulb specification across both beam positions on the VTX1800F means a single replacement part covers the full headlight assembly for any model year in the 2005-2008 range.
The 9003 standard is functionally equivalent to the H4 bulb used in international markets, though the two designations reflect different certification systems. The P43t base is common to both, but regulatory compliance differs between regions.