Sorry I haven’t been on this website in a while. I can’t say it fulfills all your criteria but the Solarforce Z1 is a great little keychain light. uses a CR123 and has a XR-G2 LED so it has quite a bit of light. unfortunately, Solarforce is getting out of the flashlight business and they have only a few left. They sell for $13.50 plus $2 shipping fee.