BMW i3 Dome Light Bulb Size

The BMW i3 dome light utilizes a 12961 bulb size for interior illumination within the cabin area. Data for the specific component covers the range from 2014 to 2021.

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
2014-2021	12961

Bulb Specifications

Description	Bulb Size
Philips part number. Miniature wedge bulb (T10) with W2.1x9.5d base. 12V, 5W.	12961

Other Locations

Additional Notes

The BMW i3 uses the 12961 bulb for its dome light across the full 2014-2021 model year range covered by these specifications.
The 12961 is a Philips part number designating a T10 miniature wedge bulb with a W2.1x9.5d base, rated at 12 volts and 5 watts.
The T10 designation refers to the bulb's tubular form factor, with the number indicating a width of roughly 10/32 of an inch, a standard sizing convention in miniature automotive bulbs.
The W2.1x9.5d base type is a wedge-style base in which the glass envelope itself acts as the retention mechanism, requiring no separate metal shell or bayonet pins for fitment.
At 5 watts, the 12961 falls within the low-wattage range typical of interior courtesy and dome lighting applications, where heat output and current draw are kept minimal.
The uninterrupted use of the same bulb specification across all eight model years indicates a consistent dome light socket design throughout the i3's production span in these records.
T10 wedge bulbs share a widely used base standard, though voltage and wattage ratings must match the original specification, as physically interchangeable bulbs with different ratings can cause electrical or thermal issues.