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It's all about the projectors. Bulbs have very little effect, because all auto manufacturers use bulbs in the 4000k-4500k range. Up close, if you look directly into any projected xenon light with a stock bulb, you won't see any hue. The blue/purple hue is an effect produced by the projector optics and the cut-off shield. Japanese cars don't necessarily have inferior projectors, as they most likely share suppliers with American and European manufacturers. The most purplish xenons I see are from Saabs and the old Audi TT.
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