The BMW 335i uses D1S and H7 bulb sizes for both high beam and low beam headlight applications. The replacement chart covers vehicle production spanning 2009 to 2015 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 BMW 335i uses two distinct headlight technologies across its model years: HID (xenon) systems fitted with the D1S bulb and halogen systems fitted with the H7 bulb. Both the high beam and low beam positions follow this dual-configuration pattern, meaning the correct replacement depends entirely on which headlamp system the vehicle was built with.
The D1S is a high-intensity discharge bulb operating at 85 volts and 35 watts. Unlike standard halogen types, it incorporates an integral ignitor within the bulb assembly and uses a PK32d-2 base. It is designed specifically for projector-type housings and cannot be used as a drop-in replacement in reflector-style halogen housings.
The H7 is a single-filament halogen bulb rated at 12 volts and 55 watts, fitted with a PX26d base. It carries ECE approval for use in Europe and worldwide markets and is also approved for use in the United States and Japan, giving it broad regulatory acceptance across regions.
Both the D1S and H7 are governed by ECE standards, which are internationally recognized regulations for automotive lighting. This classification indicates that both bulb types meet defined performance and safety criteria rather than being proprietary or manufacturer-specific formats.
For the 2014-2015 BMW 335i, both the high beam and low beam positions share the same bulb type within a given headlamp system. Vehicles with HID headlamps use the D1S in both positions, while those with halogen capsule headlamps use the H7 in both positions.
The D1S and H7 are not interchangeable. The difference in operating voltage alone, 85 volts for the D1S versus 12 volts for the H7, reflects fundamentally different electrical systems. HID-equipped vehicles include a ballast and ignitor circuit that halogen systems do not have, making cross-substitution between the two types technically incompatible.
The low beam headlight position on the BMW 335i covers a wider span of model years in the specifications than the high beam position, with low beam data present for 2009-2010 and 2012-2015. In all listed years, the same dual-configuration pattern applies, with D1S for HID-equipped vehicles and H7 for halogen-equipped vehicles.
The PK32d-2 base of the D1S and the PX26d base of the H7 are physically distinct connector formats. These differing base types serve as a mechanical safeguard against incorrect bulb installation, as neither base will seat properly in a socket designed for the other.