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Not for sure on the X5s, but on my M5 it is also for side illumination when you put on turn signals or sharply turn wheels. Test it out.. stay parked 90 degrees to a driveway and turn on the turn signal.. then increase the wheel all the way over in that direction. Watch how much the lights move around even though the car isnt. The new headlights on BMWs are frigging amazing and you dont really conciously notice how much extra light they throw out depending on where you are going.
If you have an X5 with ADAPTIVE highbeam LED headlights, you should look into having the US spec limitations turned off... then they be even more amazing.
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