The Fenix TK35 UE is one light that we have and find to be exceptionally useful while we haven’t decided for sure yet it just may be the perfect light for general use. As for how long the max output is available-I don’t know as we only use the highest setting for a few seconds to a few minutes at most as I think would be the case with nearly all other non professionals (not search and rescue or police/fire/military) though I will post that under most all circumstances high power can be a high liability, all those lumens bouncing back at you from windows/mirrors/bright metals and brighter painted-bare concrete walls and flooring/sand takes its toll quickly, I post-regrettably- from experience. And all these ‘hazards’ are generally present while hiking and camping. So while high output has a use it must be used with discretion.

Generally for us there is not a whole lot of difference between output levels over 2k lumens, certainly some but not a breathtaking amount BUT in some situations a little really can be a great deal.

As for a strobe being effective in keeping predators at bay-our experience is that it works and works well, perhaps what is key is the rate? I cannot imagine any animal, two or four legged, attacking what it cannot clearly see; if anyone takes exception I would be very interested in comments.

Should you have an issue with pests in a building or attic-consider grabbing a few inexpensive DJ type strobes, set them up and turn on for a few days or so and see what happens. For us the problem goes away-always, it has never failed BUT remember to turn on the lights after you have exited, I had to rescue the Mrs. on one occasion but only once.

Disclaimer- our results with the lights we used in the application we used them in for control of the pests we had-racoons, mice, squirrels, birds and chipmunks……………… As they say, your results may vary-we are not experts and caution against using only our experiences as the basis for a purchase.