The Ducati Monster 797 uses an H1 bulb size for high beam headlight operation and an H7 bulb size for low beam headlight operation. The replacement chart covers 2017 through 2020 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 Monster 797 uses the H1 bulb type for the high beam headlight across the 2017-2020 model years. The H1 is a single-filament bulb with a P14.5s base, operating at 55 watts on a 12-volt system, and is designed to produce a focused, intense beam suited to high beam applications.
The H7 bulb type is specified for the low beam headlight on the Monster 797 for the same 2017-2020 span. The H7 is also a single-filament bulb but uses a PX26d base, which is physically distinct from the P14.5s base of the H1, making the two types non-interchangeable despite both operating at 55 watts.
Because the H1 and H7 share no base compatibility, substituting one for the other in either headlight position is not possible without modification. Each socket on the Monster 797 is engineered to accept only its designated bulb type.
The H7 base features two pins and a retaining clip system, while the H1 base uses a single center pin with a side contact. This mechanical difference ensures that incorrect bulb installation is physically prevented under normal circumstances.
Both the H1 and H7 are halogen bulb standards defined under ECE Regulation 37, meaning replacement bulbs carrying that certification are considered electrically and photometrically equivalent to the originals specified for the Monster 797.
The consistent use of H1 for high beam and H7 for low beam across all four model years indicates that no mid-cycle revision to the headlight assembly occurred between 2017 and 2020 on this model.