Ducati 748 headlight bulbs utilize H1 size for high beam and H3 size for low beam applications. The replacement chart covers 2000 to 2002 production years with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Ducati 748 uses the H1 bulb for its high beam headlight across the 2000-2002 model years. The H1 is a single-filament halogen bulb with a P14.5s base, commonly rated at 55 watts and designed for dedicated single-function lighting circuits.
The low beam headlight on the Ducati 748 uses the H3 bulb across the same 2000-2002 span. The H3 is also a single-filament halogen type but features a PK22s base, which differs structurally from the H1 and makes the two bulbs non-interchangeable despite their similar wattage ratings.
Because the H1 and H3 use different base configurations, the high beam and low beam positions on the Ducati 748 require separate, distinct bulbs. Substituting one for the other is not physically possible without modification.
The H1 bulb's P14.5s base uses a single pin centered in a plastic cap, while the H3's PK22s base uses a metal cap with a central pin and a crimped collar. These differing retention systems reflect the separate socket designs found in the Ducati 748's headlight assembly.
Both the H1 and H3 are part of the ECE halogen bulb family and operate on a motorcycle's standard 12-volt electrical system, consistent with the Ducati 748's electrical architecture.