[alanmcorcoran]

Don't think so. The GZ is electrically challenged so most people that have messed with the headlight have used brighter or more efficient bulbs. There's not a lot of amps to spare the way the thing is designed, so be careful about adding to the load. I suppose a physically larger fixture would not necessarily use more juice, but, you would likely be adding both weight and wind resistance and, well the GZ is speed challenged, too, and neither of those is going to improve that either.