Wetdog, the Arc AAA is by far the nicest keychain light, but there are lots of other lights that work perfectly well on a neck lanyard. CMG Sonic (similar to Arc AAA), PT Blast (a bit bigger and a lot brighter), the Arc AA you already have or another one like it, CMG Infinity Ultra, UKE 2AAA (eLED or xenon), or maybe a squeeze-type light if you don't want to turn a twist bezel with ink on your hands. Heck, the AA or Ultra will stay lit through a whole shift on a NiMH AA cell, so you can just leave it running and mostly avoid getting gunk on it from turning it on and off, and drop the cell into the charger at the end of the day.