The Mercedes-Benz GLS63 AMG uses D1S and H7 bulb sizes for both high beam and low beam headlight applications. The replacement chart covers 2017 through 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.
The D1S bulb is a high-intensity discharge (HID) xenon type operating at 85V and 35W. Unlike conventional halogen bulbs, it produces light through an electrical arc between tungsten electrodes within a xenon gas-filled quartz capsule, rather than through filament incandescence.
The D1S features a PK32d-2 base with an integral ignitor built directly into the bulb unit. This integrated ignitor design means the high-voltage starting component is part of the bulb itself, distinguishing it from D2S and other discharge types where the ignitor is housed separately.
The H7 is a single-filament halogen bulb rated at 12V and 55W, fitted with a PX26d base. Its single-filament construction means it serves one lighting function per unit, which is why the Mercedes-Benz GLS63 AMG specifications list it separately for both high beam and low beam positions in halogen-equipped vehicles.
Both the D1S and H7 are manufactured to ECE standards, indicating compliance with European and international regulations. The H7 additionally carries approval for use in the United States and Japan, reflecting broader regulatory acceptance across major automotive markets.
The 2017-2019 Mercedes-Benz GLS63 AMG headlight system was offered in two distinct configurations: HID projector-type housings using the D1S, and halogen capsule housings using the H7. These two systems are not interchangeable, as each relies on fundamentally different electrical and optical hardware.
The D1S is specified exclusively for projector-type housings. This housing requirement exists because the arc-based light source of a discharge bulb requires precise optical control that projector lens assemblies provide, differing from the reflector geometry suited to halogen filament sources.
The high beam and low beam positions share identical bulb specifications across both headlamp configurations for the 2017-2019 model years. In HID-equipped vehicles both positions use the D1S, and in halogen-equipped vehicles both positions use the H7.