:sigh: Just got back from testing the light in my back yard, and I think this thing has gone screwy on me! The problem seems to vary. At the moment, the light will not turn off unless I loosen the tail cap. I can cycle through brightness modes by gently hitting the switch, but pushing it down all the way once does not put the light in standby. Holding the button down all the way and holding it for a few seconds puts the light in turbo. That should turn it off and put it in lock mode. Fully clicking the switch changes modes, just like half pressing it. Twice after replacing the batteries, the light would not power on at all unless I unscrewed the tail cap, then screwed it back on. I am guessing the switch of the light is defective, but does anybody have any ideas before I contact the dealer?