Lexus RC300 front turn signal bulbs use 7440NA, 7444NA, or 7443NA sizes, while rear turn signal bulbs require 7440NA size. The chart covers 2016 through 2024 with replacement bulb size specifications for each production year.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The three bulb types specified for the Lexus RC300 turn signals, the 7440NA, 7444NA, and 7443NA, all share the T20 wedge base form factor and operate on 12 volts with a 21-watt primary filament rating.
The 7440NA is a single-filament bulb, while the 7444NA and 7443NA are dual-filament bulbs rated at 21W/5W, meaning the secondary filament draws significantly less power than the primary.
All three bulb types carry natural amber glass, which produces the amber turn signal color through the glass itself rather than through a colored lens or housing.
All three types conform to ANSI standards applicable in the United States and Canada, placing them within a regulated performance and dimensional classification system.
The front turn signal position on the RC300 uses three distinct bulb types across the 2016-2022 model years, with the 7443NA specified for 2016-2018, the 7444NA for 2019, and the 7440NA for 2021-2022.
Because the front position transitions from dual-filament types (7443NA and 7444NA) to a single-filament type (7440NA) in 2021, substituting across these groups is not a direct interchange despite the shared T20 base.
The rear turn signal position uses the 7440NA across all listed model years, making it the single-filament standard for that position throughout the RC300's rear lighting specification.