Motorcycle Questions? Ask a Mechanic.
I would recommend runing an LED as to not risk it. You can pick up a Cyclops pretty affordably and they work well.
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I apologize for not adressing just Halogens. I would recommend upgrading the wiring to a larger gauge and running a relay thats triggered by the old systems wiring. A kit like this one is what you would want. The housing itself should hold up fine to the higher wattage.
I would suggest going here for a custom harness