Mercedes-Benz R320 high beam headlight bulbs use H7 size, while low beam headlight bulbs use H7 or D2S size depending on configuration. The replacement chart covers 2007 through 2009 vehicle 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 H7 bulb is the most frequently specified type across the Mercedes-Benz R320 headlight data, appearing in both the high beam position for all listed years and in the low beam position on vehicles fitted with halogen capsule headlamps.
The H7 is a single-filament halogen bulb rated at 12V and 55W, built to ECE standards with a PX26d base, and carries approval for use in Europe, the United States, Japan, and other worldwide markets.
The D2S is a high-intensity discharge bulb, commonly referred to as a xenon bulb, rated at 85V and 35W with a P32d-2 base. It is designed exclusively for projector-type housings and requires an external ignitor to initiate and sustain the arc discharge.
On the Mercedes-Benz R320, the low beam position accommodates two distinct bulb types depending on the headlamp system installed. Vehicles with halogen capsule headlamps use the H7, while those equipped with HID headlamps use the D2S. These two types are not interchangeable.
The high beam position across the 2007-2009 R320 is standardized to the H7 regardless of whether the vehicle carries halogen or HID low beam headlamps.
The D2S operates at 85V, a significantly higher voltage than the H7's 12V supply. This difference reflects the fundamental distinction between discharge-based and filament-based lighting technologies, and it reinforces why the two bulb types require separate, incompatible socket and ignition systems.
Although the D2S draws only 35W compared to the H7's 55W, the higher operating voltage of the HID system produces substantially greater luminous output, which is why projector-type housings are required to control light distribution with the D2S.