The Mercedes-Benz GLA45 AMG uses H15 and D3S bulbs for high beam headlight applications, along with H7 and D3S bulbs for low beam headlight functions, with each size corresponding to specific lighting requirements. A replacement chart covering 2015 through 2019 model years documents the bulb size specifications across the vehicle production range.
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 GLA45 AMG uses two distinct headlamp system types across its production years: halogen capsule headlamps and HID (High-Intensity Discharge) headlamps. These systems are not interchangeable, and each requires entirely different bulb types for both high and low beam positions.
The H15 bulb serves as the high beam bulb in halogen-equipped GLA45 AMG models from 2015-2019. It is a dual-filament halogen bulb rated at 12V with a 55W main filament and a 15W secondary filament, fitted with a PGJ23t-1 base, and built to ECE standards for use in Europe and worldwide markets.
The H7 bulb fills the low beam position in halogen-equipped models from 2015-2019. Unlike the H15, it is a single-filament halogen bulb rated at 12V and 55W, using a PX26d base. The H7 holds ECE approval and is also approved for use in the United States and Japan, giving it broader regulatory acceptance than the H15.
HID-equipped GLA45 AMG models from 2015-2018 use the D3S bulb for both high and low beam functions. This means a single bulb type handles both lighting positions in HID-configured vehicles, which differs from the halogen configuration where two separate bulb types are required.
The D3S is a mercury-free xenon discharge bulb operating at 42V and 35W, fitted with a PK32d-5 base that incorporates an integral ignitor. Its design is specific to projector-type housings, meaning it is not suited for reflector-style headlamp assemblies.
The D3S operates at 42V, which is substantially higher than the 12V supply voltage of the halogen bulbs in the same vehicle lineup. This elevated voltage is generated by the ballast within the HID system and is a defining characteristic of high-intensity discharge technology.
For the 2019 model year, the specifications list only the halogen capsule configuration, with H15 for high beam and H7 for low beam. The 2015-2018 model years each carry dual entries per beam position, reflecting the availability of both halogen and HID headlamp systems during those years.
All three bulb types used across the GLA45 AMG headlamp specifications conform to ECE standards, indicating they are certified for European and international markets. The H7 additionally carries approval for the US and Japanese markets, while the H15 and D3S do not share that designation within these specifications.