I like Doug's recommendation for his version of the Photon. If worried about the pushbutton being accidentally activated, tape a coin over the button that is slightly oversized, and bridged in such a way that the button can't be squeezed or pressed upon. If worried about moisture getting to it, coat it with a thin layer of RTV silicone, then trim away the part just over the lens. Dang near waterproof sucker then.