I'd like to see a 21700 cell light that's usb rechargeable under threads of tail cap (not under rubber cover), over 4000 lumens on turbo, and with a single warm white emitter. Should have good square threads on tail cap like a Surefire light so no cross threading. Needs a forward clicky on/off tail cap switch and a selector ring on the body for brightness settings and strobe mode. This allows for tactical and everyday carry use as light will come on in preferred setting first every time. Should have 1, 50, 150, 500, 1200, and 4000+ lumens for settings along with one strobe setting (variable frequency). L.e.d. should be Cree XHP70.2. Doesn't need SOS setting as you can signal anything in Morse code at any preferred brightness setting. Should have pistons inside on both ends (like Inova lights have on one end) but with two contact platforms on each end. One for 21700 sized batteries and one for 18650 and 123A cells. This is so you can use any sized cell without a battery magazine. Should work with 3.7 volt batteries and up to 9 volts. Should be made to work with unprotected cells. Should be type III hard anodized and IPX-8 waterproof. Electronics should be fully potted and body should work with 1 inch gun mounts. Tailcap should be a forward clicky but recessed like Klarus lights so it can tail stand as well. Should be under $100. The idea is to have both a tactical and every day carry all in one light that isn't over complicated, runs on a variety of battery options without battery magazines, and is reliable under all conditions.