Mercedes-Benz CL600 Map Light Bulb Size

The Mercedes-Benz CL600 map light uses bulb size 12961 or 6411 depending on the specific production period for the vehicle. Available data covers the range from 2001 through 2014 for the specified lighting 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
2010-2014	12961
2007-2009	6411
2001-2006	12961

Bulb Specifications

Description	Bulb Size
Philips part number. Miniature wedge bulb (T10) with W2.1x9.5d base. 12V, 5W.	12961
ANSI standard (US & Canada). Festoon bulb, 36mm length, SV8.5 base. 12V, 5W.	6411

Other Locations

Additional Notes

The Mercedes-Benz CL600 map light uses two distinct bulb types across its model years: the 12961 and the 6411, both rated at 12V and 5W.
The 12961 is a Philips part number designating a miniature wedge bulb in the T10 form factor, fitted with a W2.1x9.5d base.
The 6411 follows the ANSI standard recognized in the United States and Canada, and is a festoon-style bulb with a 36mm length and an SV8.5 base.
Wedge bulbs like the 12961 are retained by friction through their base pins, while festoon bulbs like the 6411 are held under spring tension between two end caps, making the two types physically incompatible with each other's sockets.
The 12961 is specified for the Mercedes-Benz CL600 across the 2001-2006 and 2010-2014 model years.
The 6411 festoon bulb is specified for the 2007-2009 model years, representing a departure from the wedge-type fitment used in surrounding years.
Despite the difference in bulb type between certain model years, the wattage and voltage ratings remain identical at 5W and 12V across all listed years.
The W2.1x9.5d base designation on the 12961 refers to a standardized wedge base width of 2.1mm with a 9.5mm pin spread, a common format in European automotive lighting standards.
The SV8.5 base on the 6411 denotes a festoon cap with an 8.5mm cap width, a widely used format for interior dome and map lighting in North American vehicle applications.
Substituting a 6411 festoon bulb in place of a 12961 wedge bulb, or vice versa, is not possible without a socket adapter, as the two base types are mechanically incompatible.