Lexus GS450h Turn Signal Bulb Size

The Lexus GS450h uses front turn signal bulbs in 7443NA, 7444NA, and 7440NA sizes, while rear turn signal bulbs measure 7443, 7440, and 7440NA in size. This replacement chart covers vehicle production years spanning 2007 through 2018 with corresponding bulb specifications.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Front Turn Signal

Years	Bulb Size
2016-2018	7443NA (With 2 Headlamps)
2014-2015	7443NA
2013	7444NA
2007-2011	7440NA

Rear Turn Signal

Years	Bulb Size
2016	7443 (To 10/2015)
2013-2015	7440
2007-2011	7440NA

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). Single-filament wedge bulb (T20), natural amber glass. 12V, 21W.	7440NA
ANSI standard (US & Canada). Dual-filament wedge bulb (T20). 12V, 21W/5W.	7443
ANSI standard (US & Canada). Single-filament wedge bulb (T20). 12V, 21W.	7440

Other Locations

Additional Notes

The T20 wedge bulb is the dominant form factor across all front and rear turn signal positions on the Lexus GS450h, appearing in every specification entry regardless of model year.
The "NA" suffix in bulb designations such as 7440NA, 7443NA, and 7444NA indicates natural amber glass, meaning the amber color is produced by the glass envelope itself rather than by an amber-tinted lens or housing.
The 7440NA is a single-filament T20 wedge bulb rated at 12V and 21W, and it served as the front turn signal bulb on the GS450h from 2007-2011.
The 7443NA is a dual-filament T20 wedge bulb rated at 12V, 21W/5W, and it replaced the 7440NA as the front turn signal bulb from 2014-2018, with the 2016-2018 entries specifying fitment for vehicles with 2 headlamps.
The 2013 GS450h front turn signal uses the 7444NA rather than the 7443NA. Both share the same T20 form factor, dual-filament design, natural amber glass, and 12V, 21W/5W rating, making them functionally similar but distinct by ANSI designation.
The distinction between single-filament and dual-filament T20 bulbs is a critical fitment consideration. A dual-filament bulb such as the 7443NA is not a direct drop-in replacement for a single-filament socket designed for the 7440NA, as the base configurations differ.
The rear turn signal on the Lexus GS450h used the 7440NA, a natural amber single-filament bulb, from 2007-2011, while the 2013-2015 entries specify the clear-glass 7440 in the same single-filament, 12V, 21W rating.
The 2016 rear turn signal specification lists the 7443, a clear-glass dual-filament T20 bulb rated at 12V, 21W/5W, with the qualifier "To 10/2015," indicating this fitment applies to vehicles produced up to October 2015 within the 2016 model year production run.
The clear-glass variants 7440 and 7443 share their electrical ratings with their NA counterparts but rely on an external amber lens for color output, whereas the NA versions produce amber light independently of the housing.
Substituting a clear-glass bulb such as the 7440 or 7443 in a position specified for an NA variant may result in non-amber light output if the corresponding lens or housing is also clear.