The Lexus RC350 parking light requires a 7443NA bulb size for proper installation and function within the lighting assembly. Data for the specified component covers the range from 2015 through 2018.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Lexus RC350 front parking light position uses two closely related bulb types across its model years: the 7444NA for 2017-2019 and the 7443NA for 2015-2018.
Both the 7444NA and 7443NA are ANSI-standardized bulb types, meaning their specifications are governed by a common North American standard applicable in the United States and Canada.
Each bulb is a dual-filament wedge type housed in a T20 form factor, which refers to a 20mm wide wedge base without external metal contacts.
The dual-filament design allows a single bulb to serve two distinct brightness levels, operating at either 21 watts or 5 watts depending on which filament is active.
Both bulbs carry the "NA" suffix, which denotes natural amber glass. This coloring is built into the glass envelope itself rather than achieved through a coated or painted lens.
Both types operate on a 12-volt electrical system, consistent with standard automotive low-voltage architecture.
The 7444NA and 7443NA share identical electrical ratings of 12V and 21W/5W, as well as the same T20 wedge base and natural amber glass construction, making their specifications functionally very similar.
Despite their near-identical specifications, the 7444NA and 7443NA are distinct part numbers, and fitment for a given model year is tied to one specific type rather than the other being a confirmed substitute.
The 2017 and 2018 model years are the only ones listed with two bulb sizes, meaning both the 7444NA and 7443NA appear as front parking light specifications for those years.