These high quailty replacement bulbs are perfect for a change in application or to replace another less reputable brand of bulbs that has failed. All bulbs carry a LIFETIME WARRANTY! and guaranteed color correct. These are Genuine DIGITAL bulbs, the highest quality aftermarket HID conversion bulbs that can be bought, period. Rated at 3500 hrs., <200K CCT variation, and <100 lm variation. Not for use with 35w ballast or damage will occur. For use with 50w, 55w or adjustable output ballasts only! Bixenon options include a wiring harness necessary for proper high beam function.