The Lexus LS430 front and rear turn signal bulbs utilize the 7440NA and 7440 bulb sizes for replacement applications. The replacement chart covers vehicle production spanning 2001 to 2006.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Lexus LS430 uses the 7440NA for the front turn signal across all model years covered, spanning 2001-2006.
The 7440NA is an ANSI-standard single-filament wedge bulb in the T20 form factor, rated at 12V and 21W, with natural amber-tinted glass that produces a yellow-orange output directly from the bulb envelope.
The 7440 shares the same ANSI classification, T20 wedge form factor, and 12V/21W electrical rating as the 7440NA, but its glass envelope is clear rather than amber-tinted.
The rear turn signal on the Lexus LS430 uses the 7440 for the 2001-2003 model years and transitions to the 7440NA for 2004-2006.
Because the 7440 and 7440NA are physically identical T20 wedge bulbs with the same voltage and wattage, they are mechanically interchangeable, but substituting a clear 7440 where a 7440NA is specified may affect the amber color output if the lens housing is not itself amber-tinted.
Single-filament construction in both bulb types means each serves a dedicated switching function, with no shared filament for combined stop and turn signal duties.