Mercedes-Benz CLS550 Dome Light Bulb Size

Additional Notes

• The Mercedes-Benz CLS550 uses the 6411 bulb size for the dome light across all model years from 2007 to 2018.
• The 6411 is an ANSI-standardized bulb type, meaning its specifications are governed by a recognized North American standard applicable in both 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 clips rather than a traditional socket.
• The 6411 bulb has a 36mm length, which is a critical fitment factor, as festoon bulbs must match the physical span of the fixture's mounting clips.
• The 6411 uses an SV8.5 base, a designation that refers to the diameter of the end caps on a festoon bulb, and this base type must correspond to the fixture's clip width for proper installation.
• The electrical rating of the 6411 is 12 volts and 5 watts, consistent with standard low-voltage automotive interior lighting circuits.
• The uniform use of the 6411 across all twelve model years indicates that the dome light fixture design remained unchanged throughout the entire production span covered by these specifications.
• Because the 6411 is an ANSI-designated bulb, it is produced by multiple manufacturers, and any unit conforming to the 6411 standard with a 36mm length and SV8.5 base is considered a direct fitment equivalent.