Which way does the bulb mount or does it not matter. Does the brown bar go on the top or bottom? I am trying to see how I am going to mount my bulb back plate. So yes I know that there are grooves on the bulb.
OEM's almost always face down.... But, in the aftermarket world its pretty much anything goes! FYI - That's the return wire were talking about.
It has been recommended in the past that ALL projector style headlamps should have the wire facing in the down position. Now, when it comes to reflector style lamps you will need to try both and see which one produces the best result.