Blue Bird Vision School Bus Back Up Light Bulb Size

The Blue Bird Vision School Bus back up light requires a 1156 bulb size for the specific lighting components. Data for the bulb specifications covers the range from 2010 to 2017.

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
2017	1156
2010	1156

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1156

Other Locations

Additional Notes

The 1156 is the bulb size specified for the backup light on the Blue Bird Vision School Bus across both listed model years, 2010 and 2017.
The 1156 bulb follows the ANSI standard, which is the recognized classification system for automotive bulbs in the United States and Canada.
The 1156 operates on a 12-volt electrical system and draws 21 watts, which is consistent with standard single-filament automotive lighting applications.
The 1156 uses a BA15s bayonet base, a single-contact mount where the "s" designation indicates a single pin, distinguishing it from dual-contact bayonet variants.
Because the 1156 is a single-filament bulb, it serves one lighting function only, which aligns with its role as a dedicated backup light rather than a combined stop or tail light.
The BA15s bayonet base requires a quarter-turn locking motion for installation, a mechanical characteristic that differs from wedge-base or screw-base bulb types.
The 1156 is not interchangeable with the visually similar 1157 bulb, as the 1157 uses a dual-filament design and a BAY15d base with offset pins, making it physically incompatible with a BA15s socket.