this may sound far too easy, but why not use regular floodlights? when run in series you'll be searching for the blown one by replacing each lamp, one at a time, and heaven forbid 2 go at the same time! 8) 100 watt floods run in paralell are gonna run you 800 watts, and that's the generator size you wanted.

94 yj 456gears, detroit locker and 30 spline axles out back, 33" bfgs