Audi A4 Dome Light Bulb Size

Additional Notes

• The Audi A4 dome light uses the 6411 bulb size across all model years listed in the specifications, spanning 1996-2002 and 2007-2016.
• The 6411 is a festoon-type bulb, meaning it is cylindrical in shape and held in place by spring-loaded end caps rather than a socket with a plug-in base.
• The 6411 bulb operates at 12 volts and draws 5 watts, which is consistent with standard low-power interior lighting in passenger vehicles.
• The bulb measures 36mm in length, which is a critical fitment factor, as festoon bulbs of different lengths are not interchangeable even when their voltage and wattage ratings match.
• The 6411 uses an SV8.5 base, a designation that refers to the end cap style of the festoon bulb and must match the retaining clips in the fixture for proper installation.
• The 6411 designation follows the ANSI standard used in the United States and Canada, meaning the same bulb may carry different part numbers in markets that follow other regional standards.
• The consistent use of a single bulb type across the Audi A4 (1996-2016) model years listed indicates that the dome light fixture specification did not change across those generations covered in the data.