I think the assembly just degrades over time. I replaced one of my headlights, and kept all of the same modules but the new headlight has a clear brow and is a bright cool blue, whereas my older headlight is a whiter color almost on the yellower side when you can see the contrast against the new headlight. I think BMW just really dropped the ball when it came to the headlights on the 2 series. The 3 and 4 series dont have the same issue. I also restored the lens on the older headlight to see if it could possibly fix the issue but no:/
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