Lexus RC350 Courtesy Bulb Size

The Lexus RC350 courtesy light uses bulb size 194 or 168 depending on the specific application. Data for the bulb sizes covers the range from 2015 to 2022.

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	US Type	EU Type	Shop
2021-2022	194	W5W	Check Price
2015-2016	168	W5W	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 3.78W.	194	Check Price
ECE standard (Europe & worldwide). Single-filament signalling bulb with W2.1x9.5d wedge base. 12V, 5W.	W5W	Check Price
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 4.9W.	168	Check Price

Other Locations

Additional Notes

The 194 and 168 bulbs are both classified as miniature wedge bulbs under the T10 form factor, meaning they share the same physical wedge-base housing style despite differing in wattage.
Both bulb types conform to ANSI standards applicable to the US and Canadian markets, indicating a standardized specification rather than a proprietary or regional variant.
The 194 bulb operates at 12V and 3.78W, while the 168 bulb operates at 12V and 4.9W, representing a difference of approximately 1.12W between the two types.
Although the 194 and 168 share the T10 wedge-base form factor, their wattage ratings differ, and substituting one for the other may not be electrically equivalent even if physical fitment is possible.
The Lexus RC350 uses the 194 bulb for courtesy lighting in the 2021-2022 model years and the 168 bulb in the 2015-2016 model years, reflecting a specification change between those production periods.