The Honda Motorcycle CB650SC Nighthawk uses a 9003 bulb size for both high beam and low beam headlight applications. The replacement chart covers 1982 to 1985 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 Honda Motorcycle CB650SC Nighthawk uses the 9003 bulb for both the high beam and low beam headlight positions across all listed model years, 1982-1985.
The 9003 is a dual-filament halogen bulb, meaning a single bulb unit contains two separate filaments: one rated at 60W for high beam operation and one rated at 55W for low beam operation.
Because both the high beam and low beam positions share the same 9003 bulb type, a single bulb serves both lighting functions in the headlight assembly.
The 9003 bulb operates on a 12-volt electrical system, which is standard for motorcycles of this type.
The 9003 designation follows the ANSI standard recognized in the United States and Canada, and it is physically identical to the international H4 bulb type, though the two designations originate from different standardization bodies.
The 9003 bulb uses a P43t base, which is a three-pronged bayonet-style mount. This base type is specific to dual-filament headlight bulbs and is not interchangeable with single-filament base types such as P14.5s or P15d.