Lexus LS600h Dome Light Bulb Size

The Lexus LS600h dome light uses a DE3175 bulb size for interior illumination within the cabin area. Data for the specified component covers a range from 2008 through 2016.

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
2008-2016	DE3175

Bulb Specifications

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

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Additional Notes

The Lexus LS600h uses the DE3175 bulb size for its dome light across all model years represented in the specifications, spanning 2008-2016.
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 fixture, with the end caps pressing against the contacts to complete the circuit.
The DE3175 has a nominal length of 31mm, which is a critical fitment factor, as festoon bulbs must physically span the distance between the two contact clips in the housing.
The bulb operates at 12 volts, consistent with standard automotive electrical systems.
The DE3175 designation follows ANSI standards applicable in the United States and Canada, indicating the bulb conforms to a defined set of dimensional and electrical specifications within those markets.
Because the DE3175 is an ANSI-standardized part, bulbs from different manufacturers carrying the same designation are generally interchangeable, provided they match the 31mm length and end-cap contact design.
Festoon bulbs of differing lengths, such as 28mm or 36mm variants, are not interchangeable with the DE3175, as an incorrect length will result in either a loose fit or an inability to seat within the fixture.