For a 2007 BMW E90 328i, headlight bulbs depend on whether your car has halogen or factory Xenon headlights. Halogen cars use separate bulbs for low and high beams, while Xenon-equipped cars use HID bulbs with a ballast. Exact bulb types can vary by production date and market, so verify the bulb currently fitted or consult the owner's manual if in doubt.
Halogen headlights
If your 2007 E90 328i uses halogen headlights, you’ll typically have a dedicated low-beam bulb and a separate high-beam bulb in each headlight housing.
- Low beam: H7, 55W
- High beam: H1, 55W
When replacing halogen bulbs, consider replacing both sides at the same time to maintain even brightness and color. You can choose higher-performance bulbs from brands like Philips or Sylvania for improved output or whiter light, but always ensure the bulb types match your housing.
How to identify your halogen bulb type
With the power off and the hood open, access the headlight assembly and inspect the base of the bulb or the socket. The base type (H7 or H1) is printed on the bulb itself. If unsure, remove the bulb to confirm the socket shape or refer to the service manual for your exact VIN.
Xenon headlights
If your E90 328i came with factory Xenon headlights, the bulbs are HID and require a ballast. The most common bulb types for 2007-era BMW Xenon headlights are in the D-series family; D2S is the typical choice, though some early builds used D1S.
- D2S — most common HID bulb for 2007-era Xenon headlights
- D1S — used on some early builds or regional variants; verify your vehicle
When replacing HID bulbs, replace in matched pairs to maintain color and brightness. Handle bulbs with clean gloves to avoid oil contamination, and ensure the ballast and wiring are in good condition. For OEM-like performance, aim for a color temperature around 4300K and check compatibility with your vehicle’s CAN bus system. If you’re unsure, have a professional perform the replacement to avoid ballast issues.
How to verify HID bulb type
Inspect the current HID bulb inside the headlight housing or remove it to read the bulb code. Your VIN or a dealer’s parts lookup can confirm the exact bulb type used by your car’s build. If upgrading, purchase a matching pair and confirm ballast compatibility.
Summary
In summary, a 2007 BMW E90 328i may use halogen headlights (low beam H7 and high beam H1) or factory Xenon HID headlights (D2S, with D1S possible on some early builds). Always confirm the exact bulb type for your vehicle by inspecting the installed bulb or consulting official documentation, and consider replacing bulbs in pairs to maintain consistent brightness and color. For upgrades or replacements, choose reputable brands and ensure proper ballast or wiring compatibility.