The Mercedes-Benz CLK350 high beam headlight bulb uses H7 size, while low beam headlight bulb options include H7 and D2S sizes. The replacement chart covers 2006 to 2009 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 bulb is the most frequently specified type across the Mercedes-Benz CLK350 headlight data, appearing in both high beam and low beam positions for the 2006-2009 model years.
The H7 is a single-filament halogen bulb operating at 12V and 55W, fitted with a PX26d base. It carries ECE certification for use in Europe and worldwide markets, with additional approval in the United States and Japan.
The D2S is a high-intensity discharge bulb, commonly referred to as a xenon bulb, rated at 85V and 35W. It uses a P32d-2 base and is designed specifically for projector-type headlamp housings. Unlike the H7, it requires an external ignitor to initiate the electrical arc that produces light.
The Mercedes-Benz CLK350 offered two distinct low beam headlamp configurations across the 2006-2009 model years: a halogen capsule system using the H7 bulb and an HID system using the D2S bulb. The correct replacement bulb depends on which headlamp type is installed on the vehicle.
The high beam position across all four model years is standardized to the H7 bulb, with no HID variant listed for that function.
The D2S and H7 bulbs are not interchangeable. Their base types, operating voltages, and housing requirements are fundamentally different, and substituting one for the other is not supported by these specifications.
The D2S bulb's 85V operating voltage is significantly higher than the vehicle's standard 12V electrical system, which is why a dedicated external ignitor is required as part of the HID headlamp assembly.