thanks for the great input all. one more question...

on the dinotte site they have the 140L that we are talking about here and the 140R, which they describe as coming on and off the bike very quickly, but having less battery life and being brighter. is this the case? i thought all of the dinotte mounting systems were the same, why is this one quicker on/off.

for what its worth, thats my real point for wanting no battery pack, currently i leave my taillight on the bike when its parked outside, but if i had a >100 light id want to take it in with me, and i want something very convenient for on/off. anyone care to chime in on these points?