This light uses only one AA battery and weighs 1.7 oz w/o battery.
Uses a Cree 7090 XR-E LED
Mode-1: 9 lumens (34hrs)
Mode-2: 47 lumens (6hrs)
Mode-3: 94 lumens (2.2hrs)
Mode-4: 120lumens (1.5hrs)
Mode-5: Strobe
The LD-10 - - 17 days of survival use (2 continuous hours per day in Mode-1) About $58
Or the
Military/Police 5.5zoz:
225 Lumens Tactical - TK11 -- $78
And what I like best is their: "NO QUESTIONS ASKED" - UNCONDITIONAL LIFETIME WARRANTY!