The Mercedes-Benz CLA250 high beam headlight uses H15 or D3S bulb sizes, while low beam headlight applications require H7 or D3S bulb sizes. The replacement chart covers 2014 to 2019 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.
ECE standard (Europe & worldwide). Mercury-free HID (xenon) discharge bulb with PK32d-5 base and integral ignitor, for projector-type housings. 42V, 35W.
The Mercedes-Benz CLA250 uses three distinct bulb types across its headlight system: H15 for high beam halogen, H7 for low beam halogen, and D3S for both high and low beam HID configurations. Each type carries ECE certification, meaning it meets European and international lighting standards.
The H15 is a dual-filament halogen bulb rated at 12V with a 55W main filament and a 15W secondary filament, mounted on a PGJ23t-1 base. Its dual-filament design allows a single bulb to serve the high beam function while the lower-wattage filament typically handles daytime running light duties.
The H7 is a single-filament halogen bulb rated at 12V and 55W, using a PX26d base. Unlike the H15, it carries approval not only under ECE standards but also in the United States and Japan, making it one of the more broadly accepted halogen types in the specifications.
The D3S is a mercury-free HID (xenon) discharge bulb rated at 42V and 35W, fitted with a PK32d-5 base and an integral ignitor. Its higher operating voltage relative to halogen types means it requires a ballast system within the headlamp assembly and is designed specifically for projector-type housings.
For the 2017-2019 model years, the CLA250 headlight specifications list only halogen bulb types, with the H15 covering the high beam position and the H7 covering the low beam position. No HID option is listed for those years.
For the 2014-2016 model years, the CLA250 carried two parallel headlamp configurations: halogen capsule headlamps using H15 (high beam) and H7 (low beam), or HID headlamps using the D3S for both the high and low beam positions.
The H15 and H7 bulbs share the same 12V operating voltage but use physically different bases, PGJ23t-1 and PX26d respectively, making them non-interchangeable with each other or with the D3S, which operates on a separate 42V discharge circuit.
Because the 2014-2016 CLA250 offered both halogen and HID headlamp variants, the correct replacement bulb type depends on which headlamp system is installed in a specific vehicle, as substituting a halogen bulb into an HID housing or vice versa is not supported by these specifications.