D4S & D4R HID Bulbs, Ballasts & Kits

This collection includes OEM-style D4S and D4R HID bulbs, universal ballasts and complete headlight kits for vehicles equipped with factory-installed D4-series xenon headlights.
D4S and D4R use the same mercury-free HID technology but are not interchangeable:
D4S bulbs are designed for projector headlights (clear lens, focused beam), while D4R bulbs are designed for reflector headlights (open reflector bowl, shielded capsule).
Always match the exact code printed on your original bulb (D4S or D4R) or check our Factory HID Bulb Guide before ordering.
If your current D4-series lights are flickering, slow to ignite or have different colour temperatures left and right, replace both bulbs as a pair and inspect the ballast at the same time. Use this collection to find single D4S and D4R bulbs, paired bulb sets, replacement ballasts and full D4-series headlight kits. Our ballasts are universal units that accept a single 12V input and are compatible with both D4S and D4R systems; only the bulbs differ between projector and reflector housings.