Run time should be at least 3-4 hours on high, but of course the longer the better. 1 AA is probably too low and you'd need to replace the battery after every ride. 10 Wheels, does the light you linked above shoot a long
beam? I've noticed some very bright headlights on some bikes on the road that were not necessarily long beamed; they are just very noticeable. A long beam is very desirable and very useful to alert pedestrians. Btw the one I have is this
that seems almost identical). it's not too bad as far as my needs are concerned, and I wonder how the one linked above compares to it.