Honda Motorcycle CB250 Nighthawk Brake Bulb Size

The Honda Motorcycle CB250 Nighthawk brake uses 1157 as the specific bulb size for the lighting component. Data for the lighting specifications covers the period from 2001 to 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 its brake light 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 industry standard used in both the United States and Canada.
The 1157 is a dual-filament bulb, which allows it to serve two brightness levels within a single housing, a common arrangement in brake and tail light applications where a low-intensity running light and a high-intensity brake signal are required from one unit.
The 1157 operates at 12 volts, consistent with the standard electrical system voltage found in most motorcycles of this type.
The two filaments in the 1157 are rated at 21 watts and 5 watts respectively, with the higher-wattage filament corresponding to the brake signal function and the lower-wattage filament serving the tail light function.
The 1157 uses a BAY15d bayonet base, which is an offset twin-pin base design. The offset pin placement is a deliberate fitment feature that prevents the bulb from being inserted in the wrong orientation, ensuring the correct filament is activated by the correct circuit.
Because the BAY15d base uses offset pins, it is not interchangeable with single-filament bayonet bulbs that share a similar appearance but use a different pin configuration, such as the BA15s base found on the 1156 bulb.