The BMW M6 Gran Coupe uses H7 and D1S bulb sizes for high beam headlight applications, with D1S bulb size specified for low beam headlight functions. The replacement chart covers 2014 through 2016 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 halogen type operating on a single filament, commonly rated at 55 watts with a standard PX26d base. It produces a focused beam pattern suited for high beam applications and is widely used across European vehicle platforms.
The D1S bulb is a High-Intensity Discharge (HID) type that uses xenon gas and an integrated igniter within a quartz glass capsule. It operates at approximately 35 watts but produces significantly more luminous output than a comparable halogen bulb, with a color temperature typically around 4200K.
The BMW M6 Gran Coupe uses D1S bulbs exclusively for the low beam headlight position across the 2014-2016 model years, and all low beam fitments are noted as requiring HID headlamp assemblies.
For the high beam position, the 2016 M6 Gran Coupe is listed with only the H7 bulb, while the 2014-2015 model years carry dual listings of both H7 and D1S, the latter applying specifically to vehicles equipped with HID headlamps.
The presence of both H7 and D1S high beam listings for the 2014-2015 model years indicates that two distinct headlamp assembly configurations were available, and bulb selection depends entirely on which assembly type is installed on the vehicle.
The D1S designation includes the letter "S" to denote a shrouded bulb, meaning it has an integrated UV-blocking glass shield around the arc tube. This shroud is a required safety feature in projector-style HID housings and is not interchangeable with unshrouded D1R types.
H7 and D1S bulbs are not interchangeable. They differ in base type, operating voltage, power supply requirements, and housing compatibility. An HID ballast and igniter are required to operate a D1S bulb, none of which are present in a standard halogen headlamp circuit.