I would not mind a smaller light that would do the same thing as my E2E or L4, but what in the world would you do with all that heat in a smaller body? If you could put that much light/heat in an arc aaa body, you would have a hard time holding onto it. As it is, I would be a little more comfortable if the L4 head had some heat sink fins to dissipate its considerable heat, though as long as I am holding onto it continuously, it is okay. But try setting it down for a few moments while on, and the heat buildup is somewhat problematic.
I think that we will find better brightness in these smaller lights as the newer LEDs become more energy efficient, and that will happen over time. When you think about it, look how far progress has taken us already...
There will be custom lights that will do more in small packages, but read the threads carefully on some of these ultra small lights, and you will find that they are really more suitable for momentary-on situations, which is certainly a valid way to design a light, but not for everyone. I think such lights have legitimacy as personal tactical devices that are easy to EDC, as well as the fact that they are just plain cool.
I want a nice bright light that I can use to walk a trail at night, or spend ten minutes at a time looking for something in the dark that I might have dropped on the ground, or whatever, without having to worry about whether I can keep holding on to the light.
It is also possible to increase brightness in the spot at the expense of usable spill, but how far can you go with that and be comfortable? When they start to look like laser pointers... ok, I'm kidding, but you know what I mean. For normal use, I am much happier with my L4 or TW4 than my E2E, because of the wide even light field. They still have a spot, but not as intense. And I think a lot of people are starting to like it that way.
That said, when something smaller and more practical in a newer brighter LED becomes available, I am in! Sign me up on the waiting list!
David <><