Volvo C70 Dome Light Bulb Size

The Volvo C70 dome light requires a 6411 bulb size for the interior lighting system according to the provided technical specifications. Data for the bulb covers the range from 1998 through 2004.

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
2001-2004	6411
1998	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 Volvo C70 uses the 6411 bulb for its dome light across the 2001-2004 model years, as well as the 1998 model year.
The 6411 is an ANSI-standardized bulb type, meaning its physical and electrical specifications are governed by a recognized North American standard used in both the United States and Canada.
The 6411 belongs to the festoon bulb family, a cylindrical form factor that seats at both ends rather than using a screw or bayonet base.
The 6411 measures 36mm in length, which is the contact-to-contact span of the festoon body and determines whether the bulb fits a given festoon holder.
The 6411 uses an SV8.5 base, a designation that refers to the diameter of the end caps at 8.5mm, which must match the socket width in the vehicle's dome light housing.
The bulb operates at 12 volts, consistent with the standard electrical system voltage found in passenger vehicles.
At 5 watts, the 6411 is a low-wattage bulb, typical of interior courtesy and dome lighting applications where prolonged use and minimal heat output are priorities.
Because festoon bulbs are sized by both length and end cap width, a replacement bulb must match both the 36mm length and the SV8.5 base specification to seat correctly in the Volvo C70 dome light socket.