INFINITI FX50 Map Light Bulb Size

The INFINITI FX50 map light utilizes a specific 12961 bulb size for interior illumination. Data for the provided bulb specifications covers the range from 2009 to 2013.

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
2009-2013	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 INFINITI FX50 uses the 12961 bulb for the map light across all listed model years, spanning 2009-2013.
The 12961 is a Philips part number designating a miniature wedge bulb in the T10 form factor with a W2.1x9.5d base, rated at 12 volts and 5 watts.
The T10 designation refers to a tubular bulb approximately 10mm wide, a size widely used in low-current interior lighting applications such as map lights, dome lights, and instrument panel illumination.
The W2.1x9.5d base is a wedge-type base, meaning the bulb is held in its socket by the tension of the glass envelope itself rather than by a separate metal cap or bayonet fitting.
At 5 watts on a 12-volt circuit, the 12961 draws approximately 0.42 amperes, consistent with the low power demands typical of interior courtesy and reading lights.
The T10 wedge format is one of the most widely produced miniature bulb types, and numerous aftermarket equivalents exist under different part numbers, provided they share the W2.1x9.5d base and 12V/5W ratings.
When substituting an equivalent bulb, the W2.1x9.5d base specification is a critical fitment factor, as physically similar wedge bases with different pin spacing or body length may not seat correctly in the FX50 map light socket.