Yes, spin down tests probably aren't a great way to compare but the difference there is pretty striking. That said, I'm convinced that that all things being equal, the Magnics have a lot less drag (not that either has all that much drag to begin with). My guess is that if you rode both you'd come to the same conclusion.

FWIW, I'm a huge supporter of dyno light systems in general so I'm not trying to denigrate them at all. Just trying to convey my observations about the Magnics to an obviously skeptical crowd. I'd love to see an independent reviewer (Peter White or Jan Heine perhaps) do more rigorous testing when the iC lights are ready so we can get some true apples to apples results.