Have this Philips HB4 bulbs installed in my Polo 9N3 GTI and must say that you are much brighter than the standard bulbs. Also, the light cone is visibly larger than standard bulbs. The color temperature compared to standard bulbs is clearly visible to trained eyes. For durability, I can not say anything, but do the fog lights on also rather rare. Full 5 stars from me for this product !!!