When I first started this unstoppable hobby of flashlight collecting/modification, I was giddy at "how insanely bright" 120 lumens was. I rapidly began to modify 6Ps with bigger and badder mods and purchase more lights with the goal of achieving the most brightness possible.
Now, a little more experienced and (I would like to think) a bit wiser, I have concluded with much certainty that my incredible little E1L is all I personally really need for 95% of my flashlight uses, despite the fact that I use flashlights ALL the time and for every possible reason I can think of. In fact the only time I even bump it into the "high" mode of 45L is for nighttime spotting around my neighborhood on the occasional late walk or in the backyard looking for nocturnal critters. If I could only keep ONE of my lights I would probably consider my E2E with its TLS TX2 2-stage replacement head (30/220ish lumens) to be my most all-around useful setup, and since its throw/flood balance is very nicely managed the low setting doesn't look too bright although there are certainly times when it is. Nevertheless, the E1L still gets a vast majority of pocket-time unless I am planning to be outside for extended periods of time and/or I know there is a good chance I will require long-distance illumination.
I have a number of 350L+ lights but the ONLY time I ever consider any of them remotely practical other than to impress people (NOTE: for my own personal uses, in no way do I mean to speak for anyone but myself) is when I'm on long solo walks late at night. In those situations I carry my highly-customized 6P "defensive" setup with a DereeLight XP-G beamer, strike bezel, McClicky, etc. The only reason I feel such brightness necessary or even realistically useful for that matter is because I know that if/when I use that light it won't be as a close-range illumination tool but rather to "power-blind" a potential assailant or scan dark alleys etc for the presence of the aforementioned bad guy.
Don't get me wrong, I LOVE powerful lights that put out an insane amount of light, and I LOVE trying to create the most face-meltingly awesome setup with absolutely no regard or care for runtime or heat (within safe limits, of course). I just personally don't have any true use for such lights other than for my own amusement and that of the people I show them to. Simply put, a majority of my "flashlight time" is happily spent at 3 lumens, and I LOVE that too.