The Mercedes-Benz SLK250 uses D1S and H7 bulb sizes for both high beam and low beam headlight applications. The replacement chart covers 2012 to 2015 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 Mercedes-Benz SLK250 uses two distinct headlight bulb types across the 2012-2015 model years: the D1S for HID-equipped vehicles and the H7 for halogen-equipped vehicles, with both types serving both high beam and low beam functions depending on the headlamp system installed.
The D1S is a high-intensity discharge xenon bulb rated at 85V and 35W, fitted with a PK32d-2 base that incorporates an integral ignitor. Its design is specific to projector-type housings, which affects housing compatibility at the point of replacement.
The H7 is a single-filament halogen bulb rated at 12V and 55W, using a PX26d base. Unlike the D1S, it carries approval not only under ECE standards but also in the United States and Japan, reflecting broader regulatory acceptance.
Both the D1S and H7 are classified under ECE standards, meaning they conform to regulations recognized across Europe and much of the wider international market.
The D1S and H7 are not interchangeable. The D1S requires a projector-type housing and a high-voltage discharge system, while the H7 operates on a standard 12V halogen circuit. Substituting one for the other is not supported by the vehicle's electrical or optical architecture.
The headlamp system installed on a given SLK250 unit determines which bulb type applies. A vehicle fitted with HID headlamps uses the D1S across both beam functions, while one fitted with halogen capsule headlamps uses the H7 across both beam functions.
The D1S integral ignitor is a notable fitment consideration, as it means the ignition component is built into the bulb itself rather than housed separately in the vehicle's ballast system, which distinguishes it from some other HID bulb formats.
The H7's 55W rating is notably higher than the D1S's 35W, though the D1S operates at a significantly higher voltage and produces greater luminous output through the xenon discharge process rather than through increased wattage alone.