better off trying to fab a sealed battery with a headlight that takes a 1156 or 1157 bulb socket and use leds that have been fab to that type of socket. now making them that will hold up to 63 leds in one socket unit.
run for hours and hours with out draining the battery.
100 watt light would drain even a motorcycle battery down, without a charging systems and a charging system on a clone engine would need a flywheel and lighted coil unit and a reg-unit of some kind and that would add up to one big headace and $$$ if you really don't have a clue.:no::blink::shrug: