From direct testing, the Morimoto 35watt and 55watt ballasts put out 37/38watts and 52/57watts respectively. They actually do haul some serious *** and keep power constant and clean to the bulbs without fail. I know some of you guys run cheaper ebay special kits that you've said have run fine for a while, but there's more to it than just "running". Trust me, I've used cheaper kits too for giggles, but their output was never as good as the Morimotos are. Granted, you can still do better with a full system from OSRAM or Phillips, Matsumishita, etc. Those are true OEM units built into Audi/Mercedes/BMW.