Lexus IS300 Interior Door Bulb Size

The Lexus IS300 interior door utilizes bulb size 168 and bulb size 194 for illumination. Data for the specific components covers the period from 2001 through 2023.

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
2021-2023	168	W5W	Check Price
2016-2018	168	W5W	Check Price
2001	194	W5W	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 4.9W.	168	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, 3.78W.	194	Check Price

Other Locations

Additional Notes

The 168 bulb is the interior door bulb for the Lexus IS300 across the 2016-2018 and 2021-2023 model years.
The 2001 IS300 uses the 194 bulb for its interior door position.
Both the 168 and 194 are ANSI-standardized miniature wedge bulbs sharing the T10 form factor and a 12-volt operating voltage, which means they are physically interchangeable in their sockets.
Despite the shared T10 form factor, the two bulbs differ in wattage: the 168 is rated at 4.9W while the 194 is rated at 3.78W, making them electrically distinct from one another.
Because the wattage ratings differ, substituting one bulb for the other may produce variations in light output, even though the physical fit is the same.
Both bulb types carry ANSI standardization applicable to the US and Canadian markets, indicating conformance to a defined set of performance and construction criteria within those regions.