D series xenon ballasts – OEM and aftermarket replacement

The ballast reference is generally written on a label stuck on the housing. Common references include: Hella 5DV 009 000-00 (D2), Hella 5DV 009 610-00 (D1), Valeo LAD5G (D1), Valeo LAD6G (D3), Bosch AL 1 307 329 (D2) and Denso DDLT004 (D4). If the label is illegible, identify the connector type: D1/D3 ballasts have a round connector integrated into the bulb, while D2/D4 have a separate connector. AGM Vision helps with identification on request.

High-quality aftermarket ballasts offer performance very close to OEM for a price 30 to 50% lower. They use the same electronic components and meet the same voltage and power specifications. The difference lies mainly in the finishes and the manufacturer warranty. A good aftermarket ballast lasts 5000 hours or more. Entry-level ballasts should be avoided, as they can deliver unstable voltage. AGM Vision selects aftermarket ballasts tested individually.

No, D1 and D3 ballasts are not interchangeable. Although both are integrated into the base of the bulb, they have different ignition voltages and gas chemistries. D1 is designed for bulbs with mercury, D3 for mercury-free bulbs. The connectors and vehicle mounting points are also specific. Forcing a swap can damage the bulb and the ballast’s electronic circuit. Always replace with the same series. AGM Vision specifies the exact compatibility.

A slight click when switching on is normal: it is the ballast’s internal relay that activates to deliver the high ignition voltage. However, repeated clicks, a continuous humming or crackling indicate a malfunction. The ballast is probably trying to re-ignite the arc without success, which can be caused by a bulb at the end of its life or a faulty ballast. Test by swapping the bulbs from side to side to isolate the cause. AGM Vision offers guaranteed replacement ballasts.

The D-series xenon ballast is generally mounted at the rear of the headlamp unit or in the engine compartment, near the headlight. On the D1 and D3 series, the ballast is integrated into the bulb base and remains in the headlamp unit. On the D2 and D4 series, the ballast is a separate unit, secured with screws or clips. It may be accessible by opening the hood, or may sometimes require removal of the bumper or the wheel arch liner. The AGM Vision technical sheets specify the location by vehicle.

The price varies depending on the type: a quality aftermarket ballast costs between 30 and 80 euros, while an original OEM ballast (Hella, Valeo, Bosch) is between 80 and 200 euros. The choice depends on your budget and your requirement in terms of compatibility. Aftermarket offers excellent value for money for the majority of vehicles. OEM is recommended for premium vehicles with complex electronics. AGM Vision offers both options with payment in 3x or 4x free of charge from 45 €.