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I'm not weighing in on the requirement or need for the diffusing lens, but I have a question. But I note that Volvo headlight has something solid right in front of the top of the halogen bulb. My Acura TL has projector low beams and halogen high beams. The halogen high beams also function as the daytime running lights at much lower wattage. The Acura's halogen bulbs also don't have an inner diffusing lens, but they have something similar in front of the top of the halogen bulb.
Could the cover in front of the halogen bulb also act as kind of a diffuser? Also, most of the halogen bulbs I've seen have the top of the bulb frosted a dark gray while the rest of the bulb is clear.
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