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I bought some Hella sealed beam conversion headlights that use the H4 bulbs and have the euro beam pattern. I also put in a upgraded headlight harness so the power no longer goes thru the headlight switch. The bulbs I'm running are I think 55w/100w. Very good pattern for seeing deer.
You might try measuring what voltage you have to your existing headlights. If you are down a few volts it won't matter what you put in there if you don't have the electricity to run it.