I'll 2nd NoMercy on Coast headlamps. They run off AAA batteries and put out a lot of light. The model and brightness level that works best for you is something only you can decide. Where I hunt, it's open grass country with scattered oak trees so I need something that can show critters, etc. up to 200 yards away. I've found that anything over 400 lumens does that so buy my headlamps accordingly. The batteries tend to last me at least a deer season with multiple night hunts Instead of carrying spare batteries, I carry a spare headlamp. I've also noticed that it's much more comfortable to wear the light over a hat with a brim so the light at the side of the lamp doesn't get near my eyes. You may not need that level of brightness depending on the terrain you hunt so could use one of the headlamps with a lower lumen rating. If so, your batteries will last a little longer than mine.