The Lexus GS430 tail light requires a 7443 bulb size for proper installation and function within the rear lighting assembly. Available data for the specified component covers the period from 2001 through 2004.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Lexus GS430 uses the 7443 bulb across both the inner and outer tail light positions for the 2001-2005 model years.
The 7443 is a dual-filament wedge-type bulb, classified under the T20 form factor, meaning it carries two separate filaments within a single wedge base housing.
The two filaments in the 7443 operate at different wattages: 21W for the higher-intensity function and 5W for the lower-intensity function. This arrangement allows a single bulb to serve both the brake light and the running light roles simultaneously.
The 7443 conforms to ANSI standards and is rated for use in the United States and Canada, indicating it meets the electrical and photometric requirements established for those markets.
The bulb operates on a 12V electrical system, which is standard for passenger vehicles of this type.
Because the same 7443 bulb size is specified for both the inner and outer tail light positions across all listed model years of the GS430, the two positions share a common replacement part.
The T20 wedge base of the 7443 is not compatible with bayonet-style or indexed-base sockets. Substituting a single-filament wedge bulb in a dual-filament socket would result in the loss of one lighting function.
The 7440 is a related T20 wedge bulb but carries only a single filament. It is not a direct replacement for the 7443 in tail light applications where both brake and running light functions are required.