You could try a standard tympanium 4 wire(Easy to get) reg/rec along with a large capacitor as a buffer instead of a battery.

 These systems just are not meant to power a lot of light. I had my 130w RS coils on an oem stator fail after about 4 years of use. I'm now running a OEM stator with a small wheelchair led acid battery (about 3lbs and around $30,  is rated at 11 AH) this battery is way smaller than your typical motorcycle battery. The only good thing is it works (as you guys know it's not that easy).

Rogue,  I hope your friend set up works, but with a ballistic battery it will be hard to tell when it's just running off the battery or actually using the rectified output (you can test with a digital VM). Not sure how the Li batt will like the varying trickle charge from the bike. Fact is a light at the wattage is pulling way more amp than the system can generate so there is quite the loss going on there.

 Just have to remember to keep everything connected while riding in the daytime so it recharges.

Good Luck to everyone.