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I definitely feel like my e89 z4 have at least as good, if not better Xenon lights than the other cars I've driven, all with factory equipped Xenon:
-MY02 MINI (didn't have projector headlight)
-MY04 MINI (facelifted with projector headlight)
-MY09
-MY11 x3
Sounds like you have a faulty auto leveling sensor.
I actually had a faulty sensor too, and even after adjusting the lights manually, they will either be too high up or too low after a while. After I got them adjusted twice and eventually telling my dealer about it, they found a fault and replaced some parts (I think it was the light bracket or something, and stopped the headlight from adjusting itself properly), and now the headlight is perfect, and I hardly need to use my high beam (I still do use it because they are just so bright!) I would say I have at least 3-4 car length of coverage.
Before I replaced the part, I could either have my lights aiming as high as high beam of a normal car, or as low as only being able to see about 5m in front.
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