BMW 550i Dome Light Bulb Size

The BMW 550i dome light requires a 12961 bulb size for proper installation and function within the interior lighting system. Available data covers the specific range from 2006 through 2016 for the specified vehicle and component.

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
2006-2016	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 550i uses the 12961 bulb for the dome light across the 2006-2016 model years.
The 12961 is a Philips part number designating a miniature wedge bulb in the T10 form factor.
T10 refers to the bulb's tubular shape, with the number indicating a width of 10 millimeters.
The 12961 uses a W2.1x9.5d wedge base, which is a pinless base type that is held in place by the socket walls rather than by pins or a bayonet mechanism.
The bulb operates at 12 volts and 5 watts, placing it in the low-wattage range typical of interior cabin lighting applications.
The W2.1x9.5d base designation is standardized, meaning the 12961 is interchangeable with other T10 wedge bulbs sharing that same base specification, provided the voltage and wattage ratings are also matched.