I think that 25 watts is about the limit. Try to find a fully enclosed LED light that fits your budget, eBay is your friend.
Consider fabricating a mounting plate that attaches to the handlebar clamps; that allows the light to turn with the front wheels and light up the path.
Only turn the light on when needed, to prevent battery discharge.
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Weldangrind
"I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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