Lexus RX450h Turn Signal Bulb Size

Additional Notes

• The "NA" suffix on all bulb types listed for the Lexus RX450h denotes natural amber glass, meaning the amber color is produced by the glass envelope itself rather than by an amber-coated or clear lens housing.
• The T20 wedge base is the predominant base type across the front and rear turn signal positions, appearing in the 7440NA, 7443NA, and 7444NA bulbs. The T25 wedge base, used in the 3457NA and 3357NA, is a physically larger format and is not interchangeable with T20 sockets.
• The 7443NA and 7444NA are both dual-filament T20 bulbs rated at 12V, 21W/5W. The lower 5W filament typically serves a parking or daytime running function, while the 21W filament serves the active turn signal function.
• The 7440NA is a single-filament T20 bulb rated at 12V, 21W, and it is used exclusively in the rear turn signal position across all model years listed, from 2010-2022.
• For the 2010-2012 Lexus RX450h, the front turn signal fitment depends on the headlamp configuration. Vehicles without LED headlamps use the 7440NA, while vehicles equipped with LED headlamps require a different bulb type, either the 3457NA or 3357NA depending on the year.
• The 3457NA and 3357NA are T25 bulbs with higher wattage ratings than their T20 counterparts. The 3457NA is dual-filament at 27W/7W, and the 3357NA is single-filament at 27W. Their use in LED headlamp-equipped trims suggests a separate circuit or housing design specific to that configuration.
• The front turn signal bulb changed from 7440NA (single-filament) in 2010-2012 to 7444NA (dual-filament) in 2013, then to 7443NA in 2014-2018, and back to 7444NA in 2019-2022. Although 7443NA and 7444NA share the same wattage and base type, they carry distinct ANSI designations and may differ in filament positioning or base keying.
• The year 2020 is absent from the front and rear turn signal data for the RX450h, with the specifications moving directly from 2019 to 2021.