Ducati 748R high beam headlight uses H1 bulb size while low beam headlight uses H3 bulb size. Replacement chart data covers 2000 to 2002 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 Ducati 748R uses the H1 bulb for the high beam headlight across the 2000-2002 model years.
The H1 is a single-filament halogen bulb with a P14.5s base, operating at 55 watts on a 12-volt system. Its single-filament design means it is dedicated solely to one lighting function rather than serving dual roles.
The low beam headlight on the 748R uses the H3 bulb across the same 2000-2002 span.
The H3 is also a single-filament halogen bulb, but it uses a PK22s base, which is a push-and-twist connector type distinct from the P14.5s base found on the H1. These two base types are not interchangeable.
Because the H1 and H3 share a similar wattage rating of 55 watts but differ in base design and physical form, substituting one for the other in either headlight position is not possible without modification.
Both bulb types belong to the broader family of single-filament halogen bulbs, yet their connector configurations are specific to their respective housings, making correct part selection dependent on which headlight function is being serviced.