I am in the market for a high end light for my night rides. Last night, I whent on a night ride with my local shop (Cyclepath in Hayward, CA) and was offered to demo a Topeak Moonshine HID. Wow. Demo a $400 light? Of course. Wow. This thing was bright! I had been using a Performance Viewpoint halogen, and had one on my helmet, and the topeak on my bars totally engulfed the viewpoint. The Topeak's high beam is 10 watts with like 2 hours of burn time and 2.5 hours at 7 watts. I've been looking at the Light and Motion Arc lights and am totally impressed. 3 hours of burn time at 13.5 watts and 3.5 at 11 watts. They are both 400 bucks. I'm pretty sure i'll get the Light and Motion. Any body use either of the lights? By the way. I dont like Niterider.