Kia Optima Dome Light Bulb Size

The Kia Optima dome light utilizes bulb sizes 6461 and DE3423 according to the provided technical specifications for the interior lighting components. Available data covers the range from 2001 through 2020 for the specified vehicle and lighting assembly.

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
2017-2020	6461
2009-2013	6461
2007-2008	DE3423
2001-2006	6461

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 36mm length, SV8.5 base. 12V, 5W.	6461
ANSI standard (US & Canada). Festoon bulb, 41mm length, end-cap contacts. 12V.	DE3423

Other Locations

Additional Notes

The 6461 is the dominant dome light bulb type across the Kia Optima's specification range, appearing in the 2001-2006, 2009-2013, and 2017-2020 model years.
The 6461 bulb is a festoon-type unit rated at 12 volts and 5 watts, with a 36mm length and an SV8.5 base, conforming to ANSI standards for the US and Canadian markets.
The DE3423 is also a festoon-type bulb rated at 12 volts, though it measures 41mm in length and uses end-cap contacts rather than the SV8.5 base found on the 6461.
Both bulb types share the festoon form factor, meaning they are cylindrical bulbs held in place by spring-loaded sockets at each end, a common design in automotive interior lighting.
The physical length difference between the two types is significant for fitment purposes. The 6461 measures 36mm while the DE3423 measures 41mm, making the two bulbs non-interchangeable despite their similar appearance.
The Kia Optima (2007-2008) uses the DE3423 bulb, which is the longer of the two festoon types specified across the model's history.
The base type distinction between the two bulbs is a critical fitment factor. The SV8.5 base on the 6461 uses a central contact pin arrangement, whereas the DE3423 relies on metal end-caps that make direct contact with the socket clips.
Both bulb types are classified under ANSI standards, indicating they conform to standardized electrical and physical specifications recognized across the US and Canadian automotive aftermarket.