IN reply to nite nav-lighting,I am trying out a diff-approach;I am using a "sealed battery connected to a solar panel[flexible,with grommets for mounting]connected to both a "variable strobe& a directional spot lite.so far i have only gotten 9hrs use out of the battery[with 4 hrs being of "spotlite use-rocks,branches etc"]this does not seem to bad.I have not "hooked-up" my compass,or my gps unit[which will for sure cut down my NITETIME usage.I still use my headset lite,and have severalyds of reflective tape[like on semi-trucks]along the total length of my kayak[also my canoe].THIS makes for some "goofy"looks going down the interstate hyghways! ! ! ! !you would think that the coast guard would clarify the "usage laws" to be more specific. later gumby/zenyakker