Mercedes-Benz B Electric Drive Headlight Bulb Size
The Mercedes-Benz B Electric Drive high beam and low beam headlight bulbs utilize a D1S or H7 bulb size depending on configuration. The replacement chart covers 2014 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 B Electric Drive (2014-2015) accommodates two distinct headlamp technologies across both high beam and low beam positions: HID (xenon) systems using the D1S bulb and halogen systems using the H7 bulb. The correct bulb type for a given vehicle depends entirely on which headlamp system was installed at the factory.
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, meaning it is not interchangeable with housings intended for standard halogen bulbs.
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 for European and worldwide markets but also in the United States and Japan.
Both the D1S and H7 are ECE-standard bulbs, a regulatory framework used across Europe and numerous other markets worldwide. This classification governs light output, beam pattern, and safety requirements for road use.
The D1S and H7 bulbs serve identical positional roles in the B Electric Drive headlamp system, each functioning as both the high beam and low beam source within its respective headlamp type. This indicates a single-bulb-per-position design rather than a separate bulb arrangement for each beam function.
The integral ignitor on the D1S bulb is a critical fitment consideration. Because the ignitor is built directly into the bulb unit, the D1S does not require a separate external starter component, distinguishing it from other HID bulb formats that rely on standalone ignitors within the ballast assembly.
The voltage difference between the two bulb types reflects fundamentally different operating principles. The H7 operates on a standard 12V automotive circuit, while the D1S requires 85V, supplied by a dedicated HID ballast. The two systems are electrically incompatible and cannot be substituted for one another without modification to the vehicle's electrical and housing components.