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Patrick, I have experimented with a bunch of different bulbs in that headlight housing, including a couple of LED ones, which did not work out at all. The best I have found is the Sylvania Silverstar Ultra, as far as light output,and brightness. They dont last as long as the regular cheaper bulbs, it seems, though. I really just wanted the best road illumination I could get, since I like to take night rides in the summer. I am still not real happy with the high beam coverage, and plan to add some auxiliary spot lights, as soon as I find a pair I like. Rick Duarte