I'm surprised this lamp has not been mentioned:
SUREFIRE-HS2-A-BK HEAD LAMP (4.44 oz) excellent lamp. Uses the same 123A Lithium Batteries as the SteriPen.
Features
•Virtually indestructible LED emitter regulated to maximize output and runtime
•Variable light-output dial controls levels from 0 to 100 lumens
•Proprietary refractive optic produces a smooth, wide beam optimized for your field of vision
•Built-in SOS beacon can run for days on end
•Light housing can be rotated up or down 90 degrees
•Red filter (included) for low light signature and/or preserving dark-adapted vision
•High-strength aerospace aluminum body, Mil-Spec hard-anodized for extreme durability
•Submersible to 3 feet for thirty minutes
•Headband provides comfort, durability, and a secure fit with or without a helmet
•Compact integral compartment holds one 123A lithium battery








