The problem is that once you get past a few hundred lumens, "on/off" doesn't really work well. I have a small Nitecore flashlight with a since cell in it and it

The problem is that once you get past a few hundred lumens, "on/off" doesn't really work well. I have a small Nitecore flashlight with a since cell in it and it puts out 850 lumens on maximum. That's too much to read a book at night with, yet it's great for finding a lost dog in the woods.