I bought that light and returned it the following day. The light from it was adequate, though I don't think so for 30+ MPH. My big gripe was that it uses NiMH batteries which are hopeless in cold temps. Mine died at 20 minutes into an hour long ride at -15*F. Luckily I still had my cheap Chinese clone with LiIon cells mounted, it had no trouble taking me the rest of the way in to work AND home again.