Audi A8 Map Light Bulb Size

Additional Notes

• The Audi A8 map light specifications cover model years 1997 through 2010, with two distinct bulb types appearing across that span.
• The 12961 is a Philips-designated miniature wedge bulb in the T10 form factor, operating at 12V and 5W, and uses a W2.1x9.5d base. It serves as the map light bulb across the 1997-2008 model years of the Audi A8.
• The H6W is an ECE-standard single-filament signalling bulb rated at 12V and 6W, fitted with a BAX9s base. It is specified for the 2009-2010 Audi A8 map light position.
• The BAX9s base of the H6W and the W2.1x9.5d base of the 12961 are physically incompatible, meaning these two bulb types are not interchangeable despite their similar wattage ratings.
• The 1W difference in rated power between the H6W (6W) and the 12961 (5W) reflects a genuine electrical specification distinction between the two fitments, not a negligible variance.
• For the 2000-2002 Audi A8, the 12961 bulb is noted specifically as the fitment under the central rear view mirror, indicating a defined mounting location for the map light in those years.
• The ECE designation of the H6W indicates it conforms to a regulated European lighting standard, which governs its photometric and electrical performance characteristics.
• The T10 wedge format of the 12961 is among the most widely used miniature bulb configurations in automotive interior lighting, relying on the wedge-shaped glass envelope itself to retain the bulb in its socket rather than a separate locking base.