BMW 320i Headlight Bulb Size

Additional Notes

• The H7 bulb is the most frequently specified type across the BMW 320i headlight data, covering both high beam and low beam positions for the 2016-2018 model years with halogen capsule headlamps, as well as serving both functions in the 2013-2015 range where halogen capsule headlamps were fitted. It is a single-filament halogen bulb rated at 12V and 55W, built to ECE standards for use in Europe and worldwide, with a PX26d base, and it also holds approval in the United States and Japan.
• The D1S is the specified bulb for HID headlamp configurations on the BMW 320i across the 2013-2015 high beam positions and the 2013-2016 low beam positions. Unlike halogen types, it is a high-intensity discharge xenon bulb operating at 85V and 35W, fitted with a PK32d-2 base and an integral ignitor, and it is designed specifically for projector-type housings.
• The 2013-2015 high beam positions and the 2013-2016 low beam positions each carry two separate bulb size entries per year, one for halogen capsule headlamps and one for HID headlamps. This reflects a factory headlamp system option rather than a single universal fitment, meaning the correct bulb depends on which headlamp system the vehicle was built with.
• The H5001, specified for high beam positions on the BMW 320i from 1977-1983, is an ANSI-standard 4-inch square sealed beam unit operating at 12V. It is not a replaceable bulb in the conventional sense; the entire sealed unit is replaced as one assembly.
• The H5006, specified for low beam positions on the 1977-1983 model years, is an ANSI-standard 5.75-inch round sealed beam unit, also rated at 12V and replaced as a complete assembly rather than as an individual bulb.
• The H5001 and H5006 sealed beam types follow ANSI standards applicable to the United States and Canada, while the H7 and D1S types follow ECE standards. These two regulatory frameworks are not interchangeable, and the sealed beam units used in the earlier model years are structurally and electrically distinct from the capsule-style bulbs used in later configurations.
• The high beam and low beam positions on the 1977-1983 model years use different sealed beam types from each other, with the H5001 assigned to high beam and the H5006 to low beam. The two units differ in physical form, making them non-interchangeable between positions.
• For the 2016 model year, the high beam position lists only the H7 for halogen capsule headlamps, while the low beam position lists both the H7 and the D1S, indicating that HID low beam fitment extended into 2016 without a corresponding HID high beam entry for that year.