The BMW 745i high beam headlight uses an H7 bulb size while the low beam headlight requires a D2S bulb size. The replacement chart covers vehicle production years from 2002 to 2005 with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The BMW 745i uses the H7 bulb for high beam headlights across the 2002-2005 model years. The H7 is a single-filament halogen bulb rated at 12V and 55W, fitted with a PX26d base, and built to ECE standards with approval in the US and Japan.
The low beam headlights on the 2002-2005 BMW 745i take the D2S bulb, an HID (xenon) gas-discharge type rated at 85V and 35W with a P32d-2 base. Unlike the halogen H7, the D2S requires an external ignitor to initiate and sustain the arc discharge.
The D2S is designed specifically for projector-type housings. Its optical output characteristics are matched to the geometry of a projector lens, making it incompatible with reflector-type housings without significant light distribution issues.
The H7 and D2S bulbs use different base types, PX26d and P32d-2 respectively, meaning the two bulbs are not physically interchangeable with each other or with bulbs carrying different base designations.
The voltage ratings of the two bulb types differ substantially. The H7 operates at 12V, consistent with a standard automotive electrical system, while the D2S operates at 85V, a level generated internally by the HID ballast and ignitor assembly.
Both the H7 and D2S conform to ECE regulations, a set of standards governing photometric performance, color temperature range, and base dimensions for automotive lighting across European and many worldwide markets.