Lexus ES250 License Plate Bulb Size

The Lexus ES250 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 1990 to 1991 range of production 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
1990-1991	168

Bulb Specifications

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

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Additional Notes

The T10 miniature wedge is the bulb type used for the license plate position on the Lexus ES250, covering the 1990-1991 model years.
The T10 form factor uses a wedge-style base, meaning the bulb is held in place by the socket walls rather than by pins or a bayonet mechanism.
The 168 designation follows the ANSI standardization system, which applies across the United States and Canada, making the bulb widely available through North American automotive retailers.
The 168 bulb operates at 12 volts, consistent with the standard electrical system voltage found in passenger vehicles of that era.
At 4.9 watts, the 168 bulb draws a low level of power, which is typical for license plate lighting given its purely illumination function rather than signaling.
The T10 wedge base format is shared by several bulb variants beyond the 168, so substitution with a physically similar T10 bulb does not guarantee electrical equivalence unless the wattage and voltage ratings also match.