Lexus RX350L Courtesy Bulb Size

The Lexus RX350L uses a courtesy light with a 168 bulb size for the interior lighting system. Data for the specific component covers the range from 2018 to 2021.

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
2021	168
2019	168
2018	168 (From 12/2017)

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 4.9W.	168

Other Locations

Additional Notes

The 168 bulb is the sole courtesy bulb size listed for the Lexus RX350L across the 2018-2021 model years covered in these specifications.
The 168 designation follows ANSI standards as recognized in the United States and Canada, placing it within a defined regulatory framework for miniature automotive lighting.
This bulb is a T10 miniature wedge type, which refers to its wedge-shaped base that seats directly into a socket without a separate metal cap or pins.
The 168 operates at 12 volts and draws 4.9 watts, figures consistent with low-current interior courtesy lighting applications.
The 2018 model year entry carries a production date qualifier of "From 12/2017," indicating that this fitment applies only to RX350L units manufactured from December 2017 onward within that model year.
The T10 wedge form factor is shared across a wide range of vehicle makes and models, though interchangeability should be confirmed against wattage and voltage tolerances specific to each application before substitution.