The Ducati 748 SPS uses an H1 bulb size for high beam headlight operation and an H3 bulb size for low beam headlight operation. The replacement chart covers 1998 to 1999 model 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 H1 bulb is a single-filament halogen type operating on a two-pin base, commonly rated at 55 watts. It produces a focused beam pattern, which suits high beam applications where maximum forward projection is required.
The Ducati 748 SPS uses the H1 bulb for the high beam headlight across the 1998-1999 model years.
The H3 bulb is also a single-filament halogen type but uses a single-pin base with a wire connector rather than a blade-style fitting. It is rated at 55 watts in most standard automotive applications.
The low beam headlight on the 748 SPS takes the H3 bulb for the 1998-1999 model years.
The H1 and H3 bulbs are not interchangeable with each other. Despite sharing a similar wattage rating, their base configurations are physically incompatible, meaning the high beam and low beam sockets on the 748 SPS accept different bulb types.
Because the high beam and low beam positions use distinct bulb types, replacing one does not affect fitment of the other. Each position requires its own correct bulb to seat and connect properly.