Re: Nitecore Tube and V54 TubeVN (5mm, rechargeable) review: RUNTIMES, BEAMSHOTS,...
One oddity with these 'Tube' lights seems to be a susceptibility to static electricity. That is based on a couple dozen of these 'Tube' lights passing thru my hands. eg: zap'd either from sliding out of a car seat, or a deep-carpet rug (apt style). In all cases, the result is full brightness w/o control until the battery runs down which takes less than about 1/2 hour from full charge. A simple recharge and all is fully functional again. Winter in Wisconsin has faded to Spring and no static electricity problems have been observed.
I did have one Tube copy where the driver was leaky. I first noticed it only at night - a very dim glow. However if I ran it on high output for maybe 5 min, the brightness in an 'off' condition was exceeding a half-brightness of the first level until the driver cooled down. No solution for this. faulty component. No other problem noticed with that 'Tube' copy.
Otherwise, The 'Tube' has received rave comments from all that I gave one to. The first reaction is how bright the high level is. The second reaction is the clicky operation - no requirement to press and hold, etc. The simple two levels were appreciated.