The Lexus ES350 tail light utilizes a 7443 bulb size for the specific lighting component located at the rear of the vehicle. Data for the specified bulb covers the period from 2007 to 2012.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Lexus ES350 tail light specifications cover two bulb types across its listed model years: the 194 and the 7443, both of which conform to ANSI standards recognized in the United States and Canada.
The 194 is a miniature wedge bulb in the T10 form factor, rated at 12 volts and 3.78 watts. Its low wattage reflects its role as an indicator or position light rather than a high-output source.
The 7443 is a dual-filament wedge bulb in the T20 form factor, rated at 12 volts with a filament output of 21 watts and a secondary filament of 5 watts. The dual-filament design allows a single bulb to serve two lighting functions, typically combining a brighter stop light with a dimmer running or tail light function.
The outer tail light position on the Lexus ES350 uses the 7443 bulb across the 2007-2012 model years without variation.
The inner tail light position uses the 194 bulb for the 2010-2012 model years, along with the 2009 model year from August 2009 onward.
The August 2009 production date noted for the inner tail light 194 fitment indicates a mid-year specification change, meaning not all 2009 ES350 units share the same inner tail light bulb fitment.
The T10 and T20 designations refer to the wedge base width of each bulb. The T20 base of the 7443 is physically larger than the T10 base of the 194, making the two bulb types non-interchangeable with each other.
Because the 7443 carries a dual-filament construction and the 194 is a single-filament bulb, substituting one for the other would result in either incorrect wattage output or loss of a lighting function at that position.