BMW 430i Gran Coupe Dome Light Bulb Size

The BMW 430i Gran Coupe dome light requires a bulb size of 12961 for proper installation within the interior lighting housing. Data for the specific bulb requirements covers the range from 2017 to 2018.

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
2017-2018	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 12961 is a Philips part number designating a miniature wedge bulb in the T10 form factor, fitted with a W2.1x9.5d base and rated at 12 volts and 5 watts.
The T10 designation refers to the bulb's tubular shape, with the number indicating its width in tenths of an inch, making it one of the smaller wedge-type bulbs used in automotive interior applications.
The W2.1x9.5d base specification describes a wedge-style connection where the bulb's glass pinch serves as the electrical contact, requiring no separate metal socket pins.
The BMW 430i Gran Coupe uses the 12961 bulb for the dome light across the 2017-2018 model years.
At 5 watts, the 12961 operates at a low wattage consistent with interior courtesy lighting, where heat output and power draw are kept minimal.
The W2.1x9.5d base is a standardized wedge fitting, meaning the 12961 shares physical compatibility with other T10 wedge bulbs carrying the same base designation, though electrical ratings must still match the application.