Lexus RX350 Parking Light Bulb Size

The Lexus RX350 parking light requires bulb sizes 7443NA, 7444NA, and 168 depending on the specific version. Available data covers a range from 2007 through 2018 for the specified vehicle components.

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	Bulb Size
2016-2018	7443NA
2015	7444NA
2013-2014	7443NA
2007-2012	168

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament wedge bulb (T20), natural amber glass. 12V, 21W/5W.	7443NA
ANSI standard (US & Canada). Dual-filament wedge bulb (T20), natural amber glass. 12V, 21W/5W.	7444NA
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 4.9W.	168

Other Locations

Additional Notes

The Lexus RX350 parking light specifications cover model years 2007-2018 and reference three bulb sizes: 7443NA, 7444NA, and 168.
The 168 bulb is a T10 miniature wedge type rated at 12V and 4.9W, conforming to ANSI standards for the US and Canadian markets. It is a single-filament design suited to low-wattage parking light applications.
The 7443NA is a T20 dual-filament wedge bulb rated at 12V with a 21W main filament and a 5W secondary filament. Its natural amber glass produces a color shift without the use of a painted or coated lens.
The 7444NA shares the same T20 dual-filament wedge form factor and 12V, 21W/5W rating as the 7443NA, and also features natural amber glass. Both conform to ANSI standards for the US and Canadian markets.
Despite their near-identical specifications, the 7443NA and 7444NA are distinct part numbers, and the Lexus RX350 (2015) is specified for the 7444NA rather than the 7443NA used in surrounding model years. Substituting one for the other without confirming fitment compatibility carries a risk of incorrect installation.
The Lexus RX350 models from 2007-2012 use the 168 bulb for the parking light position, reflecting the smaller T10 wedge format rather than the larger T20 format adopted in later years.
Starting with the 2013 model year, the RX350 transitions to the T20 dual-filament 7443NA bulb for the parking light, representing a change from the single-filament T10 168 used in earlier generations.
The dual-filament construction of the 7443NA and 7444NA means the bulb contains two separate tungsten filaments within one envelope, allowing it to serve both a high-intensity and a low-intensity function from a single housing.
The natural amber designation in both the 7443NA and 7444NA refers to the tint of the glass envelope itself, which filters the light output to an amber hue as required by certain turn signal and parking light regulations.
All three bulb types referenced in these specifications, the 168, 7443NA, and 7444NA, are wedge-base designs, meaning they are retained by the socket through friction on the base rather than by a bayonet or screw mechanism.