Honda Motorcycle CB250 Nighthawk Tail Light Bulb Size

The Honda Motorcycle CB250 Nighthawk tail light utilizes a single 1157 bulb size for illumination across all listed versions. Available data covers the specific time range from 2001 through 2008.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
2001-2008	1157

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. 12V, 21W/5W.	1157

Other Locations

Additional Notes

The Honda Motorcycle CB250 Nighthawk uses the 1157 bulb for the tail light position across the 2001-2008 model years.
The 1157 is an ANSI-standardized bulb type, meaning its physical and electrical specifications are defined by a recognized North American standard used in both the United States and Canada.
The 1157 is a dual-filament bulb, which allows it to serve two lighting functions within a single unit. In tail light applications, one filament typically handles the running light function while the other handles the braking signal.
The 1157 operates on a 12-volt electrical system, consistent with standard motorcycle electrical architecture.
The two filaments in the 1157 are rated at 21 watts and 5 watts respectively. The higher-wattage filament produces the brighter stop light output, while the lower-wattage filament produces the dimmer running light output.
The 1157 uses a BAY15d bayonet base. The BAY15d designation indicates an offset dual-contact base, where the two pins are positioned at different heights to prevent incorrect installation of the bulb in the wrong orientation.
Because the BAY15d base uses offset pins, a single-filament bulb with a standard BAY15s base is not a direct physical substitute, as the pin alignment differs between the two base types.