Mercedes-Benz 280S Dome Light Bulb Size

Additional Notes

• The Mercedes-Benz 280S uses the 6411 bulb across all listed model years for its dome light fitment.
• The 6411 is an ANSI-standardized bulb designation, meaning it conforms to a defined set of electrical and physical specifications recognized across the United States and Canada.
• The 6411 is a festoon-type bulb, which is a cylindrical lamp that mounts by pressing its two end caps into spring clips rather than inserting into a socket.
• The bulb measures 36mm in length, which is the end-to-end span relevant to festoon clip fitment.
• The 6411 uses an SV8.5 base, a designation that refers to the 8.5mm cap width on each end of the festoon body.
• The bulb operates at 12 volts, consistent with the standard electrical system voltage found in passenger vehicles of this era.
• At 5 watts, the 6411 draws a relatively low amount of power, typical of interior courtesy lighting applications.
• The 6411 fitment applies to the 280S across the 1968-1971 and 1975-1976 model years as listed in the specifications.
• Festoon bulbs of the same length and base designation are generally interchangeable, provided the voltage and wattage ratings are matched to the original specification.
• Substituting a festoon bulb of a different length, such as 31mm or 41mm, would result in an improper fit within the 280S dome light housing, as the spring clips are sized for the 36mm span.