Made in Germany

Compatible part numbers: 66042 66140 66142 66143 66144 66145 66147 and many other 4300K D1S bulbs.

Factory original in many US and European cars. It is recommended that bulbs be purchased in pairs, so that both headlights will have matching color. Bulbs with significantly different hours of use will have different colors. As 4250K HID bulbs age the color becomes whiter moving up close to 5000 Kelvin (K)Typically it takes about 100 hours of use for this to become noticeable.