18650 or CR123A
With a rugged aluminum, waterproof and cold resistant housing, the HL55 features a compact design and high intensity performance that is a match for any backcountry and cave exploration need. These outdoor LED headlamps have four brightness levels plus 900 lumen burst mode with a maximum of 150 hours of runtime from one 18650 battery or two CR123A batteries.
This is the best headlamp I have ever used. There aren't a bunch of useless features that are there for marketing purposes. It is simply a white light headlamp with multiple brightness settings. Also it will take flat top 18650 which is a great feature in my opinion. I cannot recommend this light highly enough. It is so simple to use and and gets brighter than most people will ever need a headlamp to be. And at this price, I would say this is a very inexpensive light given the quality.
works for me
Well made product
It was $59, not $119.90. It's the 5th one I've purchased (2 for friends). That says it all.