Tuff products T180 light.
My favorite lights these days tend toward AA size personal lights. CR123 "melt your eyes out" lights are cool and I use them, but mostly for personal protection carry. For general use, these small AA lights at 100 to 200 or so lumens are just perfect and cheap to run. The T180 from Tuff Products ramps things up by having a pivoting head, reversible clip direction and the ability to run AA or CR123 batteries. You get 170 lumens for 106 minutes on a CR123 or 120 lumens for about 50 minutes on a single AA battery. There's a high or low beam and strobe and at about $69, affordable. For more info: www.americanhandgunner.com/ index, Ph: (877) 883-3776