I'm afraid my collection is not as vast as yours :) What would you recommend for a very powerful single CR123 light? Primarily looking for something with flood, tint and LED type don't bother me much.
Also, what do you think of Lenslight?
I don't have any experience with Lenslight flashlights, but I've heard good things about them.
I'm probably the wrong person to ask, for this particular recommendation. I tend to prefer larger lights (dual CR/RCR123/18650 lights), because of the better performance associated with a larger light.
I were going to try an American company, I'd probably go with Malkoff, just because I own some of their drop-ins, and they are fantastic. Bullet-proof stuff, and not outrageously priced. Many of their hosts (the bodies) support the 18650 battery (my favorite battery platform, hands-down). Also, 18650 batteries are capable of high power bursts that a lot of lights can provide, without voltage sag. They're made to take it, and they can be recharged hundreds of times. I no longer buy flashlights that won't accommodate some sort of lithium ion battery, although many will accommodate the use of 2 CR123 disposables, if need be.
Gene Malkoff stands by his work. and everything he does is first rate.
The only truly good things (in my humble opinion) that the CR123 battery offers (over the lithium ion/rechargeable battery, for instance), is that:
it can be stored for very long periods (years at a time), without losing a charge, and without leaking. Alkaline batteries will leak, given enough time, and they don't have the high current capacity that better batteries can provide.
it can operate more easily, at extreme temperatures (like the freezing cold). If you're going to be storing, or using your flashlight in an extreme environment, like that, then I would definitely recommend CR123 (disposable) batteries; but only then.
As soon as you said "very powerful", I wanted to steer you away from a single CR123 battery light. High power always comes at a cost, and it's usually in run times, in the sub-compact lights. The lack of decent heat sinking (because of the tiny bodies) usually causes these lights to run very hot, in just a short time. Bear in mind, heat (and inside moisture) are a two flashlight's worst enemies. Either can cause the light's electronics to die, prematurely.
It's hard to recommend something definitive, unless I know what kind of use the light's going to see. If you're just going to be using it momentarily, or for a few minutes at a time, daily, then you have a vast range of choices, and heat considerations aren't really going to play into the decision. If you're going to blast things with it, for extended periods, at the high power settings, I wouldn't recommend something this small, at all, because you'll be bound to overheat the light, and you may find yourself very disappointed, when the light automatically steps down to a lower mode, to protect itself from overheating. This commonly occurs with smaller regulated lights, and they're generally designed to jump to a lower mode, after a set time (It's called timed step-down). Some more expensive lights have what's called thermal step-down, and the same thing occurs, but only as needed, depending on how the light is used/how hot the light actually is. It doesn't happen at a fixed time. Many lights will step down after only a few minutes or use, by design. It's a safety feature designed into the user interface of the light. That's the trade-off of having a super compact, high-powered light - if it's a regulated light. A non-regulated light (direct drive - like your old Maglite), just drops in output, the moment the voltage drops, even a little bit. Most newer lights have electronics built into them, to maintain (regulate) some sort of constant output, within whatever their specs happen to be.
There are plenty of lights I can recommend that are similarly sized to the dual CR123 Lenslights; but I need to know more, before I can recommend any of them. The more you can tell me about the light's intended use, the better recommendation I can give you.
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