INFINITI I30 Dome Light Bulb Size

The INFINITI I30 dome light bulb uses a DE3175 size. Replacement bulb specifications are charted across the 1996 to 2001 production 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
1996-2001	DE3175

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

The INFINITI I30 uses the DE3175 bulb size for the dome light across all listed model years, spanning 1996-2001.
The DE3175 is classified as 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.
The 31mm figure in the DE3175 designation refers to the length of the bulb, which is the critical fitment factor for festoon bulbs installed in fixed-length dome light housings.
The DE3175 operates at 12 volts, consistent with the standard electrical system voltage found in passenger vehicles.
The DE3175 carries ANSI standardization, meaning the specification is recognized across the United States and Canada, and bulbs from different manufacturers sharing this designation are expected to conform to the same physical and electrical parameters.
Because festoon bulbs are held in place by spring-loaded clips at both ends of the housing, the 31mm length of the DE3175 is a fixed requirement; a bulb of a different length would not seat correctly in the INFINITI I30 dome light housing.