Summary#
The Nitecore NU25 UL is a 47-gram ultralight rechargeable headlamp that delivers 400 lumens with triple color temperatures and IP66 waterproofing. With USB-C charging, a 700mAh battery lasting up to 45 hours, and a beam that reaches 132 meters, it's the go-to headlamp for hikers, trail runners, and ultralight backpackers who refuse to carry unnecessary weight.
At a Glance#
Product : Nitecore NU25 UL
Brand : Nitecore
Best For : Ultralight hikers and trail runners who need reliable illumination under 50 grams
Form Factor : Ultralight headlamp with elastic headband, 47g total
Buy Now : 🇺🇸 Nitecore NU25 UL on Amazon US | 🇩🇪 Nitecore NU25 UL on Amazon DE
Key Highlights:
- 400-lumen max output from dual-core MCT UHE LEDs reaches 132 meters
- Weighs just 47 grams with headband — lighter than a golf ball
- Triple color temperatures (3,000K warm, 4,500K neutral, 6,500K cool) adapt to any situation
- USB-C rechargeable 700mAh battery provides up to 45 hours of runtime
- IP66 waterproof and dustproof rating handles rain, snow, and trail dust
Who Should Buy This#
The Nitecore NU25 UL hits the sweet spot for outdoor enthusiasts who obsess over every gram in their pack. It delivers 400 lumens and professional-grade features that heavier headlamps costing twice as much struggle to match — all in a package lighter than most energy bars.
Perfect for:
- Ultralight backpackers who count every gram and want a headlamp that barely registers on the scale
- Trail runners who need a secure, bounce-free headlamp that won't shift during technical descents
- Thru-hikers who want 45 hours of runtime and USB-C charging from a power bank on the trail
- Casual campers and dog walkers who want a pocketable headlamp they'll actually carry every time
Design & Build Quality#
The NU25 UL strips headlamp design down to the essentials. The main body is a compact 60mm x 33mm unit made from durable polycarbonate that clips into a minimalist bracket-and-headband system. At 47 grams total — headband included — you genuinely forget you're wearing it.
The elastic cord headband replaces the bulky nylon straps found on traditional headlamps. It stretches comfortably over beanies, helmets, or bare heads without pressure points. Two tactile buttons — different in shape — sit on top for easy one-handed operation, even with gloves. The whole thing packs down to roughly the size of a matchbox.
Key Features#
Triple Color Temperature LEDs#
The NU25 UL uses Nitecore's proprietary MCT (Multiple Color Temperatures) UHE LEDs that let you switch between three distinct color temperatures. Warm light at 3,000K preserves night vision and reduces eye strain during map reading. Neutral white at 4,500K provides the most natural color rendition for navigating technical terrain. Cool white at 6,500K delivers maximum contrast for scanning trail markers at distance.
Most headlamps in this weight class force you to pick one color temperature at purchase. The NU25 UL gives you all three in a package that weighs less than competitors offering just one.
400-Lumen Output with 132-Meter Throw#
The unibody optical lens system combines spotlight and floodlight beams to push 400 lumens to a maximum distance of 132 meters. That's enough to light up an entire campsite or spot trail markers well ahead on singletrack.
Four brightness levels let you dial output from a dim moonlight mode for tent use all the way up to full blast for navigating rocky descents. The lowest setting stretches runtime to 45 hours — enough for a multi-day trip without recharging.
Auxiliary Red Light#
A dedicated red LED offers two brightness levels for preserving night vision in camp or during group night hikes. Red light doesn't disrupt your adapted night vision the way white light does, and it won't blind your tent mate at 2 AM. Toggle between red modes independently of the main beam.
USB-C Charging#
The built-in 700mAh lithium-ion battery charges via USB-C — the same cable as your phone, power bank, and most modern gear. No proprietary cables, no disposable batteries, no adapter hunting. Intelligent charging circuitry protects against overcharging, and the all-new power indicators show remaining battery at a glance.
Technical Specifications#
Max Output : 400 lumens
Max Beam Distance : 132 meters (433 feet)
Max Beam Intensity : 4,351 candela
Color Temperatures : 3,000K (warm), 4,500K (neutral), 6,500K (cool white)
Battery : Built-in 700mAh Li-ion, USB-C rechargeable
Max Runtime : 45 hours (lowest setting)
Weight : 47g / 1.66 oz (bracket and headband included)
Dimensions : 60.0mm x 33.0mm x 25.7mm (2.36" x 1.30" x 1.01")
LED Type : NiteLab MCT UHE dual-core LEDs
Waterproof Rating : IP66 (dust-tight, resistant to powerful water jets)
Impact Resistance : 1 meter drop rated
Brightness Levels : 4 white levels + 3 special modes + 2 red levels
Pros & Cons#
Pros:
- At 47 grams, it's one of the lightest full-featured headlamps available
- Triple color temperatures adapt to camp tasks, trail navigation, and map reading
- 400-lumen max output competes with headlamps twice its weight
- 45-hour max runtime on a single charge handles multi-day trips
- USB-C charging works with any modern power bank or cable
- IP66 waterproofing handles downpours without worry
Cons:
- 700mAh battery is smaller than bulkier headlamps with 1,000mAh+ cells
- Battery is built-in and not user-replaceable in the field
- Elastic headband may feel less secure than traditional nylon straps for some users
- No lockout mode to prevent accidental activation in your pack
Final Verdict#
Buy it. The Nitecore NU25 UL proves you don't need to sacrifice brightness or features to go ultralight — 400 lumens in a 47-gram package that charges via USB-C and laughs at rain is hard to beat.
Our recommendation: Grab one for your pack and one for your nightstand. At this weight and price, there's no reason not to have a NU25 UL stashed everywhere you might need hands-free light. 🇺🇸 Nitecore NU25 UL on Amazon US | 🇩🇪 Nitecore NU25 UL on Amazon DE