The Mercedes-Benz GLC300 high beam and low beam headlight bulbs both use H7 size replacement bulbs. The chart covers 2016 through 2023 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.
The H7 bulb is the dominant type across both high beam and low beam positions in the Mercedes-Benz GLC300 specifications, appearing across multiple model years in both lighting functions.
The H7 is a single-filament halogen bulb operating at 12 volts and 55 watts, fitted with a PX26d base, which is a two-pin connector design that locks into the headlight housing with a twist-and-lock mechanism.
The H7 bulb follows ECE standards, meaning it is regulated under European and international lighting regulations, though it also carries approval for use in the United States and Japan.
For the 2016-2019 GLC300, H7 bulbs are specified for both high beam and low beam headlights without conditional notes, indicating a standard halogen headlamp configuration across those years.
The 2020 GLC300 carries a conditional qualifier for both the high beam and low beam H7 fitment, restricting that specification to vehicles equipped with halogen capsule headlamps, which indicates that not all 2020 model units share the same headlamp system.
Because the 2020 high beam H7 fitment is conditional on the presence of halogen capsule headlamps, installing an H7 bulb in a 2020 GLC300 without confirming the headlamp type first risks an incorrect fitment.
The PX26d base is not interchangeable with other common halogen bases such as H4 or H11, meaning only bulbs carrying the H7 designation with a PX26d base are compatible with the sockets described in these specifications.
The low beam specification for the 2023 GLC300 lists an H7 bulb without a conditional qualifier, placing it alongside the unconditional H7 fitments seen in the 2016-2019 model years.