BMW 525i Headlight Bulb Size

The BMW 525i high beam headlight uses H7 or 9005 bulb sizes, while low beam headlight applications require H7, D1S, or D2S bulb sizes across different model generations. The replacement chart covers 1989 through 2007 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.

High Beam Headlight

If US Type and EU Type show the same value, a direct cross-reference for this bulb is not available or the data is insufficient.

Years	US Type	EU Type	Shop
2001-2007	H7	H7	Check Price
1989-1995	9005	HB3	Check Price

Low Beam Headlight

If US Type and EU Type show the same value, a direct cross-reference for this bulb is not available or the data is insufficient.

Years	US Type	EU Type	Shop
2006-2007	D1S (With HID Headlamps)	D1S	Check Price
2006-2007	H7 (With Halogen Capsule Headlamps)	H7	Check Price
2001-2005	D2S (With HID Headlamps)	D2S	Check Price
2001-2005	H7 (With Halogen Capsule Headlamps)	H7	Check Price
1989-1995	9006	HB4	Check Price

Bulb Specifications

Description	Type	Shop
ECE standard (Europe & worldwide). Single-filament halogen bulb with PX26d base. Also approved in the US and Japan. 12V, 55W.	H7	Check Price
ANSI standard (US & Canada). Single-filament halogen bulb with P20d base. 12V, 65W.	9005	Check Price
ECE standard (Europe & worldwide). HID (xenon) discharge bulb with PK32d-2 base and integral ignitor, for projector-type housings. 85V, 35W.	D1S	Check Price
ECE standard (Europe & worldwide). HID (xenon) discharge bulb with P32d-2 base, for projector-type housings. Requires external ignitor. 85V, 35W.	D2S	Check Price
ANSI standard (US & Canada). Single-filament halogen bulb with P22d base. 12V, 55W.	9006	Check Price

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Additional Notes

The H7 bulb is the most widely specified type across the BMW 525i headlight data, serving as both the high beam and low beam (halogen configuration) bulb for the 2001-2007 model years. It is a single-filament halogen bulb rated at 12V and 55W, built to ECE standards and fitted with a PX26d base.
The 1989-1995 BMW 525i uses a split ANSI-standard halogen pairing: the 9005 for high beam and the 9006 for low beam. Though both operate at 12V, the 9005 draws 65W while the 9006 draws 55W, and their base types differ, with the 9005 using a P20d base and the 9006 using a P22d base. These two bulbs are not interchangeable with each other.
The 2001-2007 model years with HID headlamps use either the D1S or D2S xenon discharge bulb for the low beam position. Both types operate at 85V and 35W and are designed for projector-type housings, but they are not interchangeable due to differences in base design and ignitor configuration.
The D1S bulb, specified for the 2006-2007 model years with HID headlamps, incorporates an integral ignitor within the bulb itself and uses a PK32d-2 base. The D2S, specified for 2001-2005 HID-equipped vehicles, uses a P32d-2 base and requires a separate external ignitor housed within the headlamp assembly.
For the 2001-2007 model years, the low beam position has two distinct bulb specifications depending on headlamp type. Halogen Capsule Headlamp-equipped vehicles use the H7, while HID Headlamp-equipped vehicles use either the D1S or D2S. Substituting one type for the other is not supported by the specifications, as the housing and electrical systems differ between configurations.
The H7 and 9005 bulbs both serve the high beam position but apply to entirely separate production periods and are not cross-compatible. The H7 uses a PX26d base under ECE standards, while the 9005 uses a P20d base under ANSI standards, and the two base types are physically distinct.