Lexus IS300 headlight bulbs utilize D4S and 9005 sizes for high beam applications, with D4S and D2R sizes for low beam configurations across multiple model generations. The replacement chart covers 2001 through 2016 production 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 D4S bulb, used in both the high beam and low beam positions of the 2016 Lexus IS300, is a mercury-free HID xenon discharge type rated at 42V and 35W, conforming to the ECE standard applicable in Europe and worldwide.
The D4S uses a P32d-5 base and is designed specifically for projector-type headlamp housings, meaning it is not interchangeable with bulbs intended for reflector-type housings.
The 2001 IS300 uses a 9005 bulb for the high beam position, a single-filament halogen type rated at 12V and 65W with a P20d base, conforming to the ANSI standard used in the US and Canada.
The low beam position on the 2001 IS300 uses a D2R bulb, an HID xenon discharge type rated at 85V and 35W with a P32d-3 base, designed for reflector-type housings and requiring an external ignitor to operate.
The D2R and D4S bulbs share the same 35W power rating but differ in operating voltage, base type, and housing compatibility, making them non-interchangeable despite both being HID xenon types.
The D2R conforms to the ECE standard and contains mercury, distinguishing it from the D4S, which is mercury-free under the same ECE framework.
The 9005 halogen bulb operates at a significantly higher wattage than either HID type listed, at 65W versus 35W, though HID technology produces considerably greater luminous output per watt than halogen.
The 2016 IS300 specification notes HID headlamps as a conditional fitment, indicating the D4S bulb size applies only to vehicles equipped with that headlamp configuration.