Osram D4S Night Breaker Unlimited XNB Xenon HID bulb (1 bulb) Compatible replacement for all HID/Xenon headlights accepting "D4S" bulbs 2000 hour lifespan lasts 6-10 years under average daily use 4350K color produces a pure white light Meets and exceeds OE specifications for measured luminosity and reliability Night breaker HID bulbs were tested as the best bulbs by Auto Express and Auto Bild