Well, as you all should no, there is absolutely nothing I can build that would satisfy everyone. However, Alex and I have the same idea regarding programmable buttons and externally controllable buttons. I would like to make a manual option for if TSHTF and your flashlight is set to max. output at 50L. Smartphones break, especially when thrown around in cars that wreck or roll over. So, here is my idea so far, and please, anyone correct me in my thinking because I assure you most of you have more knowledge regarding this stuff than I.

It would begin with 3 or 4 "Base" models. Surefire refers to them as "Tactical", but flashlights that have a single, high output.

The "Keychain" Light should have a body that can take a single AAA battery, yet have a minimum output of 100L. It is a keychain light, if you need any higher output for a light that is less than 3" long, you need to sacrifice runtime.

On the topic of runtime, a Max. output would run until batteries were 75% depleted. Afterwards, it would default to either the next lowest setting (50L) or off.

The EDC Light, which I now know shall be smaller than I originally thought, shall be no longer than 5", with a body no bigger than .75" in diameter or cross-section. A flashlight of this size will easily accommodate 123A as well as AA size batteries. 200L seems like a reasonable output for a light of this size.

This takes me to the next point about throw. Surely, no throw is going to satisfy everyone. I used to be a bigger fan of almost laser-beam, until I had to try to find a lost Surefire Fury (Ironic, Right?). That's when I discovered that a wider throw has its major benefits, although distance is sacrificed. Sure, Mag-Lite has its adjustable beam, but let's be honest, it's terrible. I haven't played with newer LED Mags, but IIRC, at short distances with a flood beam, it creates a nice black-hole.

Well, my earlier point about "base" models brings me here. Each model would have different heads that you can utilize. Some people prefer crenellated heads, I only see them useful on 1" bodied flashlights, as that is the most comfortable for me to grip combatively. I can't say anything regarding color, as I was thinking Titanium would be the material they are made of. I'm unsure if Titanium can be anodized like Aluminum or a different coloring process.

A glowing ring seems to be a popular "Must-have" so I will find a way to incorporate that. I was thinking Tritium, but that would significantly raise the price of the flashlight.

Sorry I'm all over the board here, but one point brings me to another. Price; I'm sure not all of us can afford to purchase Ti flashlights. I can't even afford to replace the Surefire I lost. EDC Base models would cost around $25 for an Aluminum light, Aluminum head, and Aluminum Tail Cap, $45 for Ti. Keychain models, I would hope to place somewhere in the $15 range, $25 for Ti if possible.

Tailcaps.. Where the magic happens. Let's start with the plain-jane! You press it, the light comes on. base models would have 2 options, tail-clicky, and tactical (twist to constant on). both have momentary on, both have constant on, both have one output. A programmable tail cap is well beyond my capabilities as an engineer and machinist, so I'm sorry, but that just is not a possibility at this moment, unless some electrical engineer reads these forums and takes it as a challenge. However, each model (except for Vehicle, a tail-cap switch on a large light is impractical) will have a variety of available upgrades. Hi-Low, Low-Hi, Hi-Med-Low, Low-Med-Hi, Hi-Strobe-Low, Tactical Single-Output with Pressure Switch; You get the idea.

So far, I've briefly covered Keychain and EDC types, and most of the EDC upgrades would follow along the same path as Gen. Use. The vehicle light would most likely utilize an internal, removable, rechargeable battery. A secure charging mount, easily mounted on your car. I say secure, because the last place you want your vehicle's flashlight in a roll-over is at the top of the ravine you're sitting in. I may try to include a way that it activates on a lower mode (25L) when it detects a sudden change in motion, so if it does happen to break loose, it isn't impossible to find amongst 8 years worth of dropped cheeto's and McDonalds wrappers under your 3rd row seating. (nice visual, huh?)

I have a habit of over-engineering things, so it'll be weighty, but not over-encumbering. My largest issue is the lack of machinery, materials, and time. So far, what do you all like, what aspects do you hate, which ones won't work? Give me anything you can think of that will help or hurt. I greatly appreciate criticism, no matter how "harsh" you think it is.