The Lexus LS600h uses a 9005 bulb size for high beam headlight and D4S bulb size for low beam headlight applications. The replacement chart covers 2008 to 2016 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.
High Beam Headlight
Years
Bulb Size
2015-2016
9005(Halogen, For Vehicle With Pre-Collision System-With Pre-Collision Brake)
The 9005 is a single-filament halogen bulb operating at 12V and 65W with a P20d base, built to the ANSI standard used in the United States and Canada. It serves as the high beam bulb across all listed model years of the Lexus LS600h, spanning 2008-2016.
The D4S is a mercury-free HID xenon discharge bulb operating at 42V and 35W with a P32d-5 base, conforming to the ECE standard used in Europe and worldwide. Despite its lower wattage relative to the 9005, the HID discharge process produces significantly greater light output.
The D4S is specified exclusively for projector-type housings, which use a lens and reflector assembly designed to control the focused light output of a discharge arc. Installing it in a non-projector housing would produce uncontrolled light scatter.
The 9005 and D4S carry incompatible base types, P20d and P32d-5 respectively, meaning the two bulbs are not physically interchangeable with each other regardless of application.
For the 2015-2016 model years, the high beam 9005 fitment carries a conditional note specifying vehicles equipped with a Pre-Collision System with Pre-Collision Brake, indicating that this system configuration is a relevant factor in bulb fitment for those years.
The D4S low beam fitment for the LS600h is noted as applying to vehicles with HID headlamps, indicating that not all configurations within the covered years necessarily used this bulb type.
Low beam bulb data in the specifications covers 2008-2012, while high beam data extends through 2016, reflecting differing ranges of listed fitment between the two sub-parts.