I much prefer a dedicated, waterproof light. My little torch is quite bright and can thus be seen from a respectable distance, and has a three hour burn time. I perceive its value to be greater as a means for me to be found on the surface at night as opposed to using it to help navigate aboard a blacked-out vessel. Mine has a bolt snap attached so I can clip it to my ditch bag, a line/lanyard, or other location as the need arises. I keep my bag sealed and ready to make a hasty exit, and I don’t wish to open it to retrieve anything until I’m safely out of the water.I’m thinking of using the Flashlight app in my iPhone, which seems pretty bright.