Lamborghini Diablo Dome Light Bulb Size

The Lamborghini Diablo dome light utilizes a DE3423 bulb size for interior illumination within the cabin area. Data for the specified lighting component covers the range from 1990 through 2001.

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
1990-2001	DE3423

Bulb Specifications

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

Other Locations

Additional Notes

The Lamborghini Diablo uses the DE3423 bulb size for its dome light across all listed model years from 1990 to 2001.
The DE3423 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.
Festoon bulbs are held in place by spring-loaded clips that press against the end caps, a mounting method common in European and exotic vehicle interior lighting applications.
The DE3423 has a specified length of 41mm, which is a critical fitment factor, as festoon bulbs must match the span between the fixture's contact clips to seat correctly.
The bulb operates on 12 volts, consistent with the standard automotive electrical system voltage found in the Diablo.
The DE3423 designation follows ANSI standards applicable in the United States and Canada, indicating the bulb conforms to a defined set of dimensional and electrical performance criteria within those markets.
Because festoon bulbs are sized by their physical length, a replacement bulb of a different length, even if electrically compatible, would not fit the Diablo's dome light fixture correctly.