The Ducati 1000 headlight bulb uses a 9003 size for both high beam and low beam applications. Replacement chart data covers 2003 to 2006 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 9003 bulb is the sole bulb type specified across all listed positions and model years for the Ducati 1000, covering both high beam and low beam headlight applications from 2003-2006.
The 9003 bulb is a dual-filament halogen type that operates on a single bulb housing to serve two distinct lighting functions, which accounts for its use in both the high beam and low beam positions simultaneously.
The 9003 standard specifies a rated output of 60 watts on the high beam filament and 55 watts on the low beam filament, operating at 12 volts.
The 9003 bulb shares the same physical base and construction as the H4 bulb, and the two designations are widely regarded as interchangeable, with 9003 being the North American designation and H4 the international one.
Because the Ducati 1000 uses a single 9003 bulb to handle both beam functions, a single bulb failure affects both high and low beam output at once.
The 9003/H4 format uses a P43t base, which is a three-pronged bayonet-style mount designed to ensure correct filament alignment within the reflector housing.
Substituting a single-filament bulb in place of the dual-filament 9003 would result in the loss of one beam function, as single-filament types cannot replicate both outputs from one housing.