xenon light differently bright

Hello Schraubergemeinde I have a question. Maybe you already had the same problem, or you know how to measure where or even better, how to fix it cost-effectively. So, here my problem (search function I tried, but not found anything suitable) Are the xenon lamps on my Omega B MV6 Caravan (V94 Kombi EZ.: 08/1998) different light. The driver side as always : cold-white-bluish and bright, the passenger side rather warm-red and clearly darker. Can it be due to a bad mass contact (because ignite it still does not do so properly) or do I have to worry about a component which I have to acquire again? Can one actually in front of the ballast (which is located directly at the lamp (with plug on the outside to the fender)) safely measure what? I know, ask about question…… Lack of schematics would be nice if, if you can measure what, someone could send me a picture, on the m you can see the measuring points, or briefly call the cable colors (on the plug) which are relevant for a measurement. Thanks already to many in advance greetings from the Waterkant Michel P.S. at a few pictures