Something a bit less fancy. Have you ever considered making a Fulton mod and selling them? New Fultons range from $8 to $60 depending on model. A good variety of types as well. Likely most, if not having had or used one of their lights before know their military model angle head. US made and manufactured. Assorted colors, OD green, Camo, Yellw/Orange/White/Blue/Black GiTD as well. Some models are water and even explosion proof. If you peruse military surplus, you can get them alot cheaper, have seen $4 a pc, less if in bulk. Though they may not have all the spare colored lens. Don't know if it could be done where it could run off anything that could fit, from .1 volt up to 12v for 1 single alkaline up to 8 AA and 1 A123 to 2 32650's. But a simple efficient light, super reliable and long run times. I am unsure if the switch could do things like modes, or ramping due to its on/off with signal button or not. But moonlight to 200ish lumens, in a water proof battery omnivore host that can tail stand (or be attached magnetically on some models) is appealing. Even better if using as many US made parts as possible.