Mercedes-Benz GLC350e high beam and low beam headlight bulbs both use H7 size replacement bulbs. The chart contains bulb size specifications covering 2018 to 2020 vehicle production years.
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 sole bulb type listed across all positions and years in these specifications, serving both high beam and low beam headlight functions in the Mercedes-Benz GLC350e.
The H7 is a single-filament halogen bulb operating at 55 watts with a PX26d base, a two-pin connector design that is not interchangeable with multi-filament or differently based bulb types.
H7 bulbs produce light through a tungsten filament enclosed in a halogen gas capsule, which allows the filament to burn at higher temperatures than standard incandescent bulbs while maintaining a compact form factor.
The 2020 model year carries a conditional notation specifying that the H7 fitment applies only to vehicles equipped with Halogen Capsule Headlamps, indicating that alternative headlamp configurations exist for that year with different bulb requirements.
The 2018-2019 model years list H7 for both high beam and low beam positions without any conditional notation, indicating a straightforward fitment for those years.
Because both the high beam and low beam positions share the same H7 bulb type, the headlamp assembly uses separate H7 units for each function rather than a single dual-filament bulb.
The PX26d base of the H7 is a keyed connector, meaning physical installation into a socket designed for a different base type is not possible without modification.
Owners of 2020 GLC350e vehicles should confirm their headlamp type before sourcing replacement bulbs, as the H7 specification is contingent on the presence of Halogen Capsule Headlamps specifically.