Honda Motorcycle CB250 Nighthawk high beam and low beam headlight bulbs both utilize a 9003 size. The replacement chart covers vehicle production spanning 2001 to 2008.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Honda Motorcycle CB250 Nighthawk uses the 9003 bulb size for both the high beam and low beam headlight positions across the 2001-2008 model years.
The 9003 is an ANSI-standardized bulb type recognized in the United States and Canada, operating on a 12-volt electrical system with a dual-filament halogen design rated at 60 watts for high beam and 55 watts for low beam.
Because the CB250 Nighthawk uses a single bulb type for both beam functions, the 9003's dual-filament construction is what allows one unit to serve both lighting roles from a single housing.
The 9003 bulb uses a P43t base, which is a bayonet-style mount with a 43mm collar. This base type is specific to the 9003 and its international equivalent, the H4, and is not interchangeable with single-filament base types such as P14.5t or P22d.
The 9003 and H4 bulbs share the same physical form and electrical ratings, making them functionally equivalent in most applications. However, the 9003 designation reflects the ANSI standard, while H4 reflects the ECE standard used in many other markets.