Wattage
The ones advertised in the moto rags are listed as 35 watts, which is pretty much what the stock system puts out. I may have other problems with it. Or it may be the lights themselves. I have a 10 amp 12 volt power supply and the lights drew enough for it to go into safe mode. They lit with a 12 volt car battery, but as I wrote before they are very dim, barely glowing with the the bikes output. Another thing, while the headlights are unhooked, the taillight is very bright, with the headlight hooked up, it's very dim. So, the system seems to be putting out 12 volts, maybe just not enough amps. Or again, maybe these bulbs aren't 35 watts.