Lexus RX300 License Plate Bulb Size

The Lexus RX300 license plate light requires a 168 bulb size for proper installation and function within the rear exterior lighting assembly. Data for the specified bulb covers the 1999 to 2003 production range for the vehicle.

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
1999-2003	168

Bulb Specifications

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

Other Locations

Additional Notes

The Lexus RX300 uses the 168 bulb for the license plate position across all listed model years, spanning 1999-2003.
The 168 bulb is classified as a T10 miniature wedge type, which refers to its wedge-shaped base that allows it to be inserted directly into a socket without a separate metal base or pins.
It operates at 12 volts and draws 4.9 watts, placing it in the low-wattage range typical of license plate and courtesy lighting applications.
The 168 is an ANSI-standardized bulb recognized in both the United States and Canada, meaning it conforms to a defined set of electrical and physical specifications shared across manufacturers.
The T10 wedge form factor is widely used across many vehicle makes and models, though fitment in a specific socket depends on the housing design of the individual vehicle.
Because the 168 and closely related T10 wedge bulbs such as the 194 share the same base type, they are sometimes listed as interchangeable, but their wattage ratings differ, and substitution can affect circuit load and bulb longevity.