Mercedes-Benz ML450 high beam headlight bulbs use H7 size, while low beam headlight bulbs use H7 or D1S size depending on configuration. The replacement chart covers 2010 to 2011 vehicle 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 a single-filament halogen type operating at 12V and 55W, fitted with a PX26d base. It serves both high beam and low beam positions in the Mercedes-Benz ML450 for the 2010-2011 model years.
The D1S is an HID (high-intensity discharge) xenon bulb rated at 85V and 35W, using a PK32d-2 base with an integral ignitor. It is specified exclusively for low beam positions equipped with HID headlamps on the 2010-2011 ML450.
The D1S bulb requires a projector-type housing due to the optical precision needed for HID light distribution. Its integral ignitor means the starting electronics are built directly into the bulb unit rather than housed separately.
The ML450 low beam position accommodates two distinct bulb types depending on headlamp configuration. H7 applies to standard halogen headlamp assemblies, while D1S applies to vehicles fitted with HID headlamps. These two types are not interchangeable.
Both the H7 and D1S bulbs carry ECE certification, the regulatory standard used across Europe and much of the world. The H7 additionally holds approval in the United States and Japan, whereas the D1S specification does not note equivalent approvals outside ECE jurisdictions.
The high beam position on the 2010-2011 ML450 uses only the H7 halogen bulb. No HID variant is listed for the high beam, unlike the dual-option arrangement present in the low beam position.
The voltage difference between the H7 (12V) and D1S (85V) reflects fundamentally different operating principles. Halogen bulbs rely on resistive heating of a tungsten filament, while HID bulbs sustain an electrical arc between electrodes within a xenon gas-filled quartz capsule.