Mitsubishi Starion Dome Light Bulb Size

The Mitsubishi Starion dome light requires a DE3175 bulb size for proper installation within the interior overhead housing. Available data for the specified component covers the period from 1983 through 1989.

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
1983-1989	DE3175

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 31mm length, end-cap contacts. 12V.	DE3175

Other Locations

Additional Notes

The DE3175 is the dome light bulb size for the Mitsubishi Starion across all model years covered in the specifications, spanning 1983-1989.
The DE3175 is a festoon-type bulb, meaning it is cylindrical in shape and makes electrical contact through metal caps at each end rather than through a base socket.
Festoon bulbs are held in place by spring-loaded clips within the dome light housing, with the end caps pressing against the contacts to complete the circuit.
The DE3175 has a nominal length of 31mm, which is the figure the "31" in its designation refers to and is the critical fitment factor for festoon bulbs in this application.
The bulb operates on a 12-volt electrical system, consistent with standard automotive electrical architecture.
The DE3175 designation follows ANSI standards applicable to the United States and Canada, meaning the specification reflects North American market fitment.
Festoon bulbs of differing lengths are not interchangeable in this application, as a bulb shorter or longer than 31mm will either fail to make contact with the housing clips or will not seat correctly.