The BMW 330i uses high beam and low beam headlight bulbs in H7 and D2S sizes depending on the model variant and lighting system configuration. The replacement chart covers vehicle production years spanning 2001 to 2018 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 rated at 12V and 55W, operating on a PX26d base. It follows the ECE standard recognized across Europe, the US, and Japan, making it one of the more widely accepted halogen formats in international automotive use.
The D2S bulb is a high-intensity discharge (HID) xenon type rated at 85V and 35W, mounted on a P32d-2 base. Unlike halogen bulbs, the D2S requires an external ignitor to initiate and sustain the electrical arc that produces light, and it is designed specifically for projector-type headlamp housings.
The BMW 330i uses the H7 bulb for both high beam and low beam positions across the 2017-2018 model years when equipped with halogen capsule headlamps, and the same H7 fitment applies to the 2001 model year for the high beam position without a headlamp-type qualifier.
For the 2002-2006 model years, the BMW 330i accommodates either H7 or D2S bulbs in both the high beam and low beam positions, with the correct fitment determined strictly by whether the vehicle is equipped with halogen capsule headlamps or HID headlamps.
The D2S bulb appears in the low beam specification for the 2001 model year when the vehicle is fitted with HID headlamps, while the H7 covers the low beam position under halogen capsule headlamp configurations for that same year.
Because the H7 and D2S bulbs use entirely different bases, PX26d and P32d-2 respectively, and operate on different electrical systems, the two types are not interchangeable regardless of the position they occupy in the headlamp assembly.
The D2S operates at 85V, a significantly higher voltage than the 12V supply used by the H7. This difference means the D2S relies on a dedicated ballast and ignitor system within HID-equipped headlamp assemblies, which is absent in halogen capsule headlamp configurations.
Both the H7 and D2S carry ECE certification, meaning both types meet the same international regulatory framework for road use, though their optical and electrical operating principles differ substantially.