Mercedes-Benz C300 Trunk Bulb Size

The Mercedes-Benz C300 trunk light utilizes a specific 12961 bulb size for illumination within the rear storage compartment area. Provided information covers a continuous span of time starting from 2008 through 2023.

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 Type	Shop
2008-2023	12961	Check Price

Bulb Specifications

Description	Type	Shop
Philips part number. Miniature wedge bulb (T10) with W2.1x9.5d base. 12V, 5W.	12961	Check Price

Other Locations

Additional Notes

The Mercedes-Benz C300 uses the 12961 bulb for the trunk across the 2008-2023 model years.
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 form factor is a small cylindrical wedge-type bulb commonly used in low-intensity interior lighting applications such as trunk, map, and courtesy illumination.
The W2.1x9.5d base designation describes a wedge-style connection where the bulb's glass envelope itself acts as the retention mechanism, requiring no separate metal socket pins.
At 5 watts, the 12961 draws minimal current, which is typical for non-critical interior lighting positions where sustained low-level illumination is sufficient.
The consistency of the 12961 specification across all listed model years indicates a single bulb type covers the full 2008-2023 production range for this position on the C300.
T10 wedge bulbs are widely cross-referenced under multiple part numbers by different manufacturers, though fitment should be confirmed against the W2.1x9.5d base specification to avoid socket incompatibility.
Substituting a bulb with a higher wattage rating than the specified 5W in this position carries a risk of exceeding the thermal tolerance of the surrounding trim materials and the socket itself.