I have the same problem as my mate does in his cupra. He fitted them on both cars so..... lol anyways the drivers side bulb seems to be a hell of a lot brighter than the passengers when i squat down and look directly at the headlights you can really notice it! but when driving aroound the light on the road looks equal each side. Its the main beam bulb not the full beam one it has a plastic like brolly thingy on the end of it lol i know im very technical Any suggestions??