The Mercedes-Benz R350 high beam headlight uses an H7 bulb size, while low beam headlight applications utilize H7, D1S, or D2S bulb sizes depending on configuration. The replacement chart covers 2006 through 2012 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 H7 is a single-filament halogen bulb operating at 12V and 55W, fitted with a PX26d base. It holds ECE certification for use in Europe and worldwide markets, and carries approval for use in the United States and Japan as well.
The Mercedes-Benz R350 uses the H7 bulb across all high beam positions for every model year in the specifications, covering 2006-2012 without variation.
Low beam fitment on the R350 depends on the headlamp system installed. Vehicles equipped with halogen capsule headlamps use the H7, while those equipped with HID headlamps use a discharge bulb type that varies by year.
The D2S was the HID low beam bulb for the 2006-2010 R350. It operates at 85V and 35W, uses a P32d-2 base, and requires an external ignitor to initiate the arc discharge. It is designed for projector-type housings.
The 2011-2012 R350 with HID headlamps uses the D1S rather than the D2S. The D1S operates at the same 85V and 35W ratings but differs in that it incorporates an integral ignitor within the bulb itself, eliminating the need for a separate external unit.
The base types of the D1S (PK32d-2) and D2S (P32d-2) are physically distinct, making the two bulbs non-interchangeable despite sharing identical voltage and wattage ratings. Substituting one for the other is not supported by the specifications.
The shift from D2S to D1S in the low beam HID position between the 2010 and 2011 model years represents a change in ignitor architecture. The D1S integrates the ignitor into the bulb, whereas the D2S relies on a separate ignitor housed within the ballast or fixture.
Both D1S and D2S bulbs are classified under the ECE standard and are intended exclusively for projector-type headlamp housings, which use a lens and reflector system to shape and direct the discharge arc into a controlled beam pattern.