Isuzu NPR-HD Dome Light Bulb Size

The Isuzu NPR-HD dome light utilizes a DE3175 bulb size for interior illumination within the cabin area. Provided information covers a specific span of time ranging from 1999 through 2013.

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
1999-2013	DE3175 (Tilt Cab)

Bulb Specifications

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

Other Locations

Additional Notes

The Isuzu NPR-HD uses the DE3175 bulb size for the dome light across all specified model years, spanning 1999-2013.
The DE3175 is an ANSI-standardized bulb type, meaning its specifications are governed by a recognized North American standard applicable in both the United States and Canada.
The DE3175 is a festoon-style bulb, which is a cylindrical lamp that makes electrical contact through metal caps at each end rather than through a base socket.
The festoon format of the DE3175 means it seats by pressing lengthwise between two spring clips or contact points inside the dome light housing.
The DE3175 has a nominal length of 31mm, which is the critical fitment factor when considering cross-compatible festoon bulbs, as festoon lamps must physically span the contact points of the housing.
The bulb operates at 12 volts, consistent with the standard electrical system voltage of light-duty and medium-duty commercial vehicles.
All entries in the specifications are designated for the Tilt Cab body configuration, indicating this fitment applies specifically to that cab style of the NPR-HD.
The DE3175 designation combines a festoon category prefix with a length code, and it is interchangeable with other bulbs sharing the same 31mm festoon format and 12V rating, provided the wattage is also compatible with the housing.