BMW 328i Headlight Bulb Size

Additional Notes

• The H7 bulb is the most frequently specified type across the BMW 328i headlight data, appearing in both high beam and low beam positions across multiple model years. It is a single-filament halogen bulb operating at 12V and 55W, built to the ECE standard used in Europe and worldwide, with a PX26d base. Despite its European origin, it also carries approval for use in the US and Japan.
• The 9005 and 9006 bulbs follow the ANSI standard used in the US and Canada, and both are single-filament halogen types. The 9005 operates at 12V and 65W with a P20d base and is specified for the high beam position on the BMW 328i for 1996-1998. The 9006 operates at 12V and 55W with a P22d base and covers the low beam position for those same years. Although both are ANSI halogen bulbs, their bases differ, making them non-interchangeable with each other or with H7 fitments.
• The D1S and D2S bulbs are both HID (xenon) discharge types operating at 85V and 35W, but they differ in a critical way. The D1S has an integral ignitor built into the bulb itself and uses a PK32d-2 base, while the D2S requires a separate external ignitor and uses a P32d-2 base. These two bulb types are not interchangeable despite sharing the same wattage and voltage ratings.
• For 2014-2015, the BMW 328i high beam headlight is listed with two distinct bulb sizes depending on headlamp type: D1S for HID headlamps and H7 for halogen capsule headlamps. This indicates that the correct bulb is determined by the specific headlamp system installed on the vehicle, not solely by the model year.
• The low beam headlight on the BMW 328i for 1999-2000 similarly carries dual fitments, with H7 specified for halogen capsule headlamps and D2S specified for HID headlamps. The D2S in this position requires an external ignitor, which is a separate component from the bulb itself.
• The D1S bulb is specified for projector-type housings, as noted in its description. This housing requirement is a fitment consideration, since HID discharge bulbs of this type are designed to work within the optical geometry of projector housings and are not intended for use in reflector-type assemblies.
• The high beam headlight for the BMW 328i in 2016 is listed exclusively with the H7 bulb under halogen capsule headlamps, with no HID option present for that year in the high beam position, unlike the 2014-2015 entries which include both H7 and D1S options.
• The transition from ANSI-standard bulbs (9005 high beam, 9006 low beam) in 1996-1998 to ECE-standard H7 bulbs in 1999-2000 reflects a change in the bulb specification for the BMW 328i between those model years. The base types across these standards are all distinct, meaning none of the ANSI bulbs from the earlier years are physically compatible with the H7 sockets used in later years.