Quote Originally Posted by Dave View Post
The projectors in the factory xenon lamps are different to the halogen lamps


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more correct would be to say , not all -non xenon lights can have xenons .there is lamps which can have xenons ,even if they came from factory as normal halogen light . I did same swap on my E39 ,bought special holders from UK ,and got original ballasts and xenon bulbs and all work perfect .