The Lexus RC F back up light utilizes a 921 bulb size for illumination purposes. Data for the specific component covers the range from 2015 through 2019.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 921 bulb is the sole bulb size specified across all back up light positions on the Lexus RC F for the 2015-2019 model years.
The 921 is a wedge-type bulb, classified under the T15 designation, which refers to its tubular glass envelope size measured in eighths of an inch.
Wedge bulbs use a pinched glass base as the electrical contact, eliminating the need for a separate metal cap or bayonet pins.
The 921 operates at 12 volts and 16 watts, which is consistent with standard automotive low-voltage electrical systems.
The 921 follows ANSI standardization, meaning the designation is recognized across both the United States and Canada and corresponds to a defined set of electrical and physical characteristics.
Both the outer and inner back up light positions on the RC F share the same 921 bulb size, indicating interchangeability between those two positions within the vehicle.
The inner back up light specification for the 2015 model year carries a production date qualifier of "From 09/2014," meaning the 921 fitment applies only to vehicles produced from September 2014 onward within that model year.