The Ducati Monster 900 headlight uses a 9003 bulb size for both high beam and low beam functions. The replacement chart covers vehicle production spanning 1997 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 headlight bulb type specified for the Ducati Monster 900 across all listed model years and headlight positions.
The 9003 bulb is a dual-filament halogen type rated at 60 watts on the high beam filament and 55 watts on the low beam filament, operating on a standard H4 base.
Because the 9003 bulb carries both high and low beam filaments within a single housing, the Ducati Monster 900 uses one physical bulb per headlight assembly to serve both beam functions.
The 9003 and H4 designations refer to the same bulb construction, with 9003 being the North American designation and H4 the international ECE designation, making them functionally interchangeable in most applications.
The 9003 specification applies uniformly to the 1997-2002 model years of the Monster 900, indicating no headlight bulb changes were introduced during that production span.
The dual-filament nature of the 9003 means that a single bulb failure can affect both high and low beam output simultaneously, as both functions depend on the same unit.
Substituting a single-filament bulb such as an H1 or 9005 in place of the 9003 would not satisfy both beam functions, as those types lack the second filament required for the alternate beam position.