Lexus SC300 Dome Light Bulb Size

The Lexus SC300 dome light uses a DE3175 bulb size for interior illumination. Replacement bulb specifications in the chart span 1992 to 2000 model years.

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
1992-2000	DE3175

Bulb Specifications

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

Other Locations

Additional Notes

The Lexus SC300 uses the DE3175 bulb size for the dome light across all model years represented in the specifications, spanning 1992-2000.
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 that press against the end caps, a mounting method common in interior dome and map light applications.
The DE3175 carries an ANSI designation, indicating it conforms to a standardized specification recognized in the United States and Canada.
The bulb has a nominal length of 31mm, which is the critical fitment factor for festoon bulbs, as the spring clips must exert proper tension against the end caps to maintain a reliable electrical connection.
The DE3175 operates at 12 volts, consistent with the standard electrical system voltage found in passenger vehicles.
The "DE" prefix in the DE3175 designation identifies it as a dome or interior festoon bulb within the ANSI classification system, distinguishing it from exterior festoon types.
Festoon bulbs of similar length but different end-cap configurations or voltage ratings are not interchangeable with the DE3175, as physical fit alone does not guarantee electrical compatibility.