INFINITI Q50 Trunk Bulb Size

The INFINITI Q50 trunk light uses 194 and 158 bulb sizes for the interior cargo area illumination. Available data for the specified vehicle covers the period from 2014 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

If US Type and EU Type show the same value, a direct cross-reference for this bulb is not available or the data is insufficient.

Years	US Type	EU Type	Shop
2021-2023	194	W5W	Check Price
2018-2020	158	158	Check Price
2014-2016	158	158	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, 3W.	158	Check Price

Other Locations

Additional Notes

The INFINITI Q50 trunk uses two distinct bulb sizes across its model years: the 194 for 2021-2023 and the 158 for 2014-2016 and 2018-2020.
Both the 194 and 158 are ANSI-standardized miniature wedge bulbs sharing the same T10 form factor and 12-volt operating voltage, which means they are physically interchangeable in terms of socket fitment.
Despite their shared T10 socket and voltage rating, the two bulbs differ in wattage. The 194 draws 3.78 watts, while the 158 draws 3 watts, making them electrically distinct.
Because the 194 and 158 carry different wattage ratings, substituting one for the other in the INFINITI Q50 trunk socket introduces a mismatch with the original electrical specification for that model year.
The T10 designation refers to a tubular bulb with a wedge-style base, a format widely used in low-current automotive interior and cargo lighting applications.
The ANSI classification of both bulbs indicates conformance to a standardized performance specification recognized across the United States and Canada, establishing consistent output and dimensional tolerances between manufacturers.