The Lexus IS350 parking light uses bulb sizes 7444NA, 7443NA, and 168 depending on the specific version of the vehicle. Data for the lighting components covers the range from 2006 to 2021.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The front parking light of the Lexus IS350 uses three distinct bulb types across its model years: the 7444NA, 7443NA, and 168.
The 7444NA and 7443NA are both dual-filament T20 wedge bulbs rated at 12V with a 21W/5W power split, meaning one filament draws 21 watts and the other draws 5 watts depending on the active circuit.
Both the 7444NA and 7443NA feature natural amber glass, which produces an amber-colored output without the use of a separate amber lens or colored coating.
The 7444NA and 7443NA conform to ANSI standards applicable in the United States and Canada.
The 7444NA is the specified bulb for the 2017-2019 and 2021 model years of the Lexus IS350 front parking light position.
The 2016 IS350 front parking light takes the 7443NA, which shares the same T20 form factor, dual-filament design, natural amber glass, and 12V/21W/5W rating as the 7444NA, though the two carry different ANSI part numbers and are not confirmed as interchangeable by these specifications.
The 168 is a single-filament T10 miniature wedge bulb rated at 12V and 4.9W, making it considerably lower in wattage than the T20 bulbs used in later model years.
The 168 bulb is the specified front parking light for the 2006-2009 IS350 model years and also conforms to ANSI standards for the US and Canadian markets.
The T10 and T20 designations refer to the bulb body size, with T10 being physically smaller than T20, meaning the 168 and the 7444NA or 7443NA are not physically interchangeable.