Mercedes-Benz GLA250 Dome Light Bulb Size

The Mercedes-Benz GLA250 dome light requires a 6411 bulb size for proper illumination within the interior cabin area. Available data for the specified component covers the 2015 to 2020 range.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
2015-2020	6411

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 36mm length, SV8.5 base. 12V, 5W.	6411

Other Locations

Additional Notes

The Mercedes-Benz GLA250 uses the 6411 bulb size for the dome light across the 2015-2020 model years.
The 6411 is a festoon-type bulb, meaning it is cylindrical in shape and mounts by pressing between two spring-loaded end caps rather than inserting into a socket.
The 6411 bulb follows the ANSI standard, which applies to the United States and Canada.
The bulb operates at 12 volts and 5 watts, which is typical for low-draw interior lighting applications in passenger vehicles.
The 6411 has a length of 36mm, a specification that is critical for festoon fitment, as an incorrect length will prevent the bulb from making proper contact with the mounting clips.
The SV8.5 base designation refers to the end cap style of the festoon bulb, with 8.5mm indicating the cap width, which must correspond to the holder spacing in the fixture.
Because festoon bulbs are sized by physical length and cap width, substituting a bulb with a different length or base designation risks fitment failure even if the voltage and wattage ratings match.