I started looking at the Fenix TK50 the otherday. Blistering turbo, 120 lumens on high for 10 hours and I THINK 4 lumens runs for 480 HOURS! It's a 2D cell light and would be possibly a good choice for "outages" or other bumps in the night among other good outdoors/emergency uses. Still checking it out, supposed to have a Loooooong throw but I don't know how much spill light it lets out. Some spill is a good thing.