Petzl IKO CORE

Some people call this the ultimate running headlamp. It's lightweight, bright with multi beam options, comfortable and secure with the semi-rigid adjustable AIRFIT headband, water resistant, rechargeable, reflective at the rear, has two lock functions and can be flattened to fit into a pocket. It comes with a diffuser storage pouch that makes a great lantern, and the headlamp can be worn around the neck, attached to a tent pole, etc. It has 3 lighting levels adjustable with one button and the many LEDs provide a smooth light distribution.

It comes with the CORE rechargeable battery but will also run on standard AAA's. The battery takes about 3 hours to charge and will last 12 hours on standard white mode (100 lm). The headlamp will run at 500 lumens with the core battery but adjusts to 350 lumens when it detects standard batteries.

Ouput: 500 lumens 
Weight:  79 g
Modes:  two beam types (flood or mixed), white (3 levels: max burn time, standard, max power)
Battery:  CORE rechargeable (included) or 3 AAA 
Burn time:  100 hrs (6 lm, lowest power), 9 hrs (100 lm, standard power), 2.5 hrs (500 lm, max power)
Weather protection:  IPX4