A great ultralight backup light, the new Ion is small enough to stash just about anywhere, plus the reflector-housed, 1/2 watt LED casts a far-reaching beam for finding your way up that final pitch of 5.11 or down that last mile back to the trailhead. Our lightest headlamp at 30 grams (1 oz), the Ion has a pivoting head that angles the light anywhere you need it, and a replaceable 6-volt battery provides power for 15 hours at the low setting and 3 hours on high. Yes, the Ion is unnoticeable in