Mercedes-Benz E550 Dome Light Bulb Size

Additional Notes

• The Mercedes-Benz E550 uses the 6411 bulb size for the dome light across the 2007-2017 model years.
• The 6411 is an ANSI-standardized bulb designation recognized in both the United States and Canada.
• This bulb follows a festoon design, meaning it is cylindrical in shape and mounts by pressing between two spring-clip contacts at each end rather than inserting into a socket.
• The 6411 has a physical length of 36mm, which is a critical fitment factor, as festoon bulbs must match the span between the fixture's contact clips.
• The base type is SV8.5, a designation that refers to the diameter of the metal end caps on the festoon bulb, which must correspond to the contact clips in the housing.
• The 6411 operates at 12 volts, consistent with standard automotive electrical systems.
• The bulb carries a 5-watt power rating, placing it in the low-wattage range typical of interior courtesy lighting.
• Because the 6411 is an ANSI-standardized part, bulbs from different manufacturers carrying the same designation share the same voltage, wattage, length, and base type, making cross-brand substitution straightforward within that standard.
• The consistent use of a single bulb specification across all listed model years indicates that the dome light housing design remained unchanged throughout the E550's production run in that period.