Porsche 911 Map Light Bulb Size

Additional Notes

• The Porsche 911 map light uses two distinct bulb types across its model years, with the 6411 festoon bulb fitted in 1995-1998 models and the 12961 wedge bulb fitted in 1999-2012 models.
• The 12961 is a Philips part number designation for a T10 miniature wedge bulb operating at 12 volts and 5 watts, with a W2.1x9.5d base.
• The 6411 follows the ANSI standard used in the United States and Canada, and is a festoon-style bulb with a 36mm length, an SV8.5 base, and identical 12V, 5W electrical ratings to the 12961.
• Although both bulb types share the same voltage and wattage ratings, their base types are physically incompatible with each other, meaning the 12961 wedge and the 6411 festoon are not interchangeable.
• The W2.1x9.5d base of the 12961 is a wedge-type fitting where the glass envelope itself acts as the contact point, requiring a socket designed specifically for that form factor.
• The SV8.5 base of the 6411 is a festoon fitting where the bulb is held under spring tension between two end caps, a mounting method that is structurally different from a wedge socket.
• The 12961 designation as a Philips part number means it may also be cross-referenced under equivalent ANSI or trade designations such as the W5W, which shares the same T10 wedge form factor and electrical specifications.
• The Porsche 911 (1999-2012) requires the 12961 bulb for the map light position, reflecting the T10 wedge socket installed in that generation of the vehicle.