I need a headlamp to be used in the woods. What I am looking for is a zoomable lamp with good light output. Power source can be any, even a separate battery pack. The most important thing is it must have a tight beam with very good throw. I am not that concerned about how bright the flood setting is, but if it is good it is an added bonus. Would like to keep it under $ 50, but can go higher if needed. Thank you in advance.