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As Nate said one of the keys to headlight performance is voltage level. Most people don't realize the impact on a halogen bulb. Light output will vary at the 3.4th power to voltage changes. So lose 15% voltage and the lumen output drops 50%. The other way around, increase 15% v and you pop light output 100%.
Now you can't go crazy on voltage increases with a bulb that has a design voltage of 13.5, or so, as you will shorten the life of the filament too much. But the voltage delivered to the bulbs on stock wiring in our cars can be in the area of 10.5v pretty easy. Get it up to 14 and amazing things happen. Combine with some 90/100 watt H4 bulbs and increases in the range of 450% in light output is actually sort of common.
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