The Nitecore NU25 UL is an ultralight headlamp that weighs a mere 47 grams yet delivers 400 lumens of white output alongside dedicated red and red-flash auxiliary modes. Designed for trail runners, ultralight backpackers, and thru-hikers who count every gram, the NU25 UL packs a built-in rechargeable battery and USB-C charging into a featherweight package that you barely feel on your head. The triple output system — white for general illumination, red for preserving night vision, and red flash for emergency signaling — covers the essential lighting needs of any outdoor adventure.
At 47 grams the NU25 UL is lighter than many headlamp competitors that offer half the output, making it a favorite among the ultralight community where every gram matters. The USB-C charging port accepts power from the same cable and chargers you already carry for your phone and GPS, simplifying your charging kit on multi-day trips. IP66 water resistance handles rain and sweat without issue, and the compact form factor stows easily in a running vest pocket when not in use. The red LED modes are particularly valuable for camp use where blasting white light disturbs tent neighbors, and the red flash provides a safety beacon visible to vehicles and rescue teams.