BMW Alpina B7 Dome Light Bulb Size

The BMW Alpina B7 dome light utilizes a 12961 bulb size for interior illumination within the cabin area. Available data for the specific component covers the period from 2007 through 2015.

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
2011-2015	12961
2007-2008	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 Alpina B7 uses the 12961 bulb across all listed model years for the dome light position.
The 12961 is a Philips part number designating a miniature wedge bulb in the T10 form factor, operating at 12 volts and 5 watts.
The T10 designation refers to the bulb's tubular shape, with the number indicating a width of roughly 10 thirty-seconds of an inch, making it one of the most widely used miniature bulb sizes in automotive interior lighting.
The W2.1x9.5d base type is a wedge-style connector, meaning the bulb is held in place by tension from the socket rather than by a bayonet or screw mechanism.
At 5 watts, the 12961 falls within the low-wattage range typical of interior courtesy and dome lighting, where heat output and current draw are kept minimal.
The 2013-2015 model years of the BMW Alpina B7 share an identical dome light bulb specification with the 2007-2008 model years, indicating consistent socket compatibility across a broad production span.
Because the T10 wedge base is a standardized form factor, aftermarket and OEM-equivalent bulbs from manufacturers other than Philips may physically fit the same socket, provided they match the W2.1x9.5d base and 12V rating.
The 5-watt power rating is a relevant consideration when substituting LED replacements, as LED T10 bulbs draw significantly less wattage while producing comparable or greater light output, though socket compatibility still depends on the W2.1x9.5d base fitting.