u/Affectionate_Cow3076

Title.) Hi all, I'll need to buy a head lamp for running at night/early morning, but ai have no idea on how many lumens it should have, or if there are specific characteristic required. Ideally, I'd like to have at least 4 hours of good illumination, I din't think I need lomger for now. What do you guys use? Also, I often see (on yt videos) ultra runners with very bright lamps, and they run all night. How do they manage batteries?

Thanks