Mercedes-Benz C280 Dome Light Bulb Size

Additional Notes

• The Mercedes-Benz C280 uses the 6411 bulb for the dome light across all model years listed in the specifications, spanning 1994-2000 and 2006-2007.
• The 6411 is an ANSI-standardized bulb designation, meaning it conforms to a defined set of electrical and physical parameters recognized across the United States and Canada.
• The 6411 is a festoon-style bulb, a form factor characterized by a cylindrical tube with metal end caps that seat into spring-loaded holders rather than a screw or bayonet socket.
• The 6411 bulb measures 36mm in length, which is the contact-to-contact span of the festoon tube and is the critical fitment factor when considering a replacement or substitute.
• The 6411 uses an SV8.5 base, a designation that refers to the 8.5mm width of the end caps on the festoon body, which must match the holder spacing in the vehicle's dome light housing.
• The bulb operates at 12 volts, consistent with the standard electrical system voltage of passenger vehicles.
• The 6411 is rated at 5 watts, placing it in the low-wattage category typical of interior courtesy and dome lighting applications.
• Because the 6411 is an ANSI-standardized type, equivalent bulbs from different manufacturers sharing the same voltage, wattage, base type, and length are generally considered interchangeable substitutes.
• Festoon bulbs of differing lengths, such as 31mm or 41mm variants, are not interchangeable with the 36mm 6411, as an incorrect length will prevent proper contact with the spring clips in the housing.