The Lexus RX350 high beam headlight uses a 9005 bulb size, while low beam headlights use H11, D4S, or D2S bulb sizes depending on configuration. The replacement chart covers 2007 through 2015 model years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 9005 bulb is the specified high beam type across all Lexus RX350 model years covered in these specifications, spanning 2007-2015. It is a single-filament halogen bulb operating at 12V and 65W, fitted with a P20d base and built to the ANSI standard used in the United States and Canada.
The H11 is the specified low beam bulb for halogen capsule headlamp configurations across all years in these specifications. It operates at 12V and 55W, uses a PGJ19-2 base, and conforms to the ECE standard, though it also carries approval for use in the United States.
Low beam fitment on the Lexus RX350 is headlamp-system-dependent. Vehicles equipped with halogen capsule headlamps take the H11, while those equipped with HID headlamps require a discharge bulb. These two bulb types are not interchangeable.
For model years 2010-2015, the specified HID low beam bulb is the D4S. This is a mercury-free xenon discharge bulb rated at 42V and 35W, using a P32d-5 base and designed specifically for projector-type housings.
For model years 2007-2009, the specified HID low beam bulb is the D2S rather than the D4S. The D2S operates at 85V and 35W, uses a P32d-2 base, and requires an external ignitor to initiate the arc discharge.
The D2S and D4S bulbs use different base types, P32d-2 and P32d-5 respectively, making them physically non-interchangeable despite sharing the same wattage rating. Substituting one for the other is not supported by these specifications.
The shift from D2S to D4S in HID-equipped vehicles between the 2009 and 2010 model years reflects a change in the discharge bulb standard. The D4S eliminates mercury from its construction, whereas the D2S does not carry that designation.
The 9005 and H11 bulbs both operate on a standard 12V automotive circuit, while the D4S and D2S are high-voltage discharge types requiring dedicated ballast systems. This distinction means the high beam circuit and the HID low beam circuit operate under fundamentally different electrical conditions.