Nitecore NU27 Review

Overview

The Nitecore NU27 is a 56 g rechargeable headlamp that puts 600 lumens, three selectable white color temperatures and a red auxiliary light into a bar-shaped body about the size of a matchbox. It is aimed at thru-hikers, runners and anyone who counts ounces but doesn’t want to give up throw. The trade-off: a spotty, artifact-prone beam and middling color rendering in exchange for a lot of light per gram and per dollar.

Key Specs

Spec	Detail
Weight	56 g (1.98 oz)
Max output	600 lumens
Max beam distance	123 m
Max beam intensity	3,705 cd
LEDs	Nitecore MCT UHE, 3000K / 4500K / 6500K, plus auxiliary red
Battery	Built-in 850 mAh Li-ion
Max runtime	57 hours (lowest setting)
Charging	USB-C
Dimensions	65.5 × 33.9 × 25.5 mm
Water resistance	IP66
Impact resistance	1 m
Street price	About $45

Performance

Brightness and throw. The NU27’s headline number holds up better than most. CleverHiker’s testers put it beside the Petzl Actik Core, which carries the same 600-lumen rating, and judged the Nitecore noticeably brighter. They also credited it with the best weight-to-brightness ratio in their headlamp lineup. Five levels step down from the 600-lumen turbo through 400, 200 and 70 lumens to a 6-lumen tent setting. Measured beam distance falls from 123 m on turbo to 99 m, 70 m, 43 m and 13 m across those levels. Peak intensity on turbo is 3,705 cd.

Beam quality. This is where the NU27 loses points. The beam is built around an oval hot spot with a wide spill, and testers describe it as spotty rather than a true flood. Tim McMahon, an independent flashlight reviewer, and CleverHiker both noted a rectangular, lens-flare-like artifact at the edge of the spill, a product of the square-cornered TIR optic. Some buyers find it distracting when it’s thrown on a nearby wall or tent. On a trail it fades into the background, but anyone who wants a dedicated flood mode will notice it’s absent.

Color temperatures. Three white tints are the reason to buy this over its predecessor, the NU25. Warm 3000K is gentler on the eyes at camp and, per McMahon, cuts through fog better. Cool 6500K reaches farther down the trail. Neutral 4500K serves as the default. Measurements put the tints close to the claimed values, with the cool white slightly less blue than advertised. Color rendering is the weak spot: McMahon measured 68 CRI, and CleverHiker’s testers also flagged poor color accuracy across all three. Trail maps and food look a bit off. That is acceptable for walking, less so for sorting gear.

Battery and charging. The 57-hour figure applies to the 6-lumen setting, so it describes a tent-light scenario, not a night-hiking one. At 200 lumens, the claimed runtime is 6.5 hours. McMahon’s bench testing found runtime slightly shorter than rated, though output was well regulated. An Australian retailer’s verified owner reported real-world runtime about 20–30 percent below the spec sheet. The battery is sealed in, so it can’t be swapped for a spare. Charging runs through a USB-C port on the side and takes roughly 1.25 hours, with a four-LED indicator that blinks blue as the charge climbs. The Trek’s reviewer, a thru-hiker, liked that the port sits firm rather than loose, and that the same cable now serves a satellite communicator.

Interface. Controls are two buttons with a satisfying click, plus a lockout mode that keeps the lamp from switching on inside a pack. The learning curve is short, though some owners say the settings are confusing at first. The real annoyance is the lack of memory: the lamp returns to its lowest neutral setting every time it’s switched off, so anyone who prefers warm white must reselect it each night. There are two red-light modes.

Comfort and carry. The stretchy, perforated headband has a silicone grip strip and reflective lettering. Reviewers report it breathes well, wicks sweat and stays put on night runs with no bounce, despite having no over-the-top strap. The lamp pops off the band and rides on a four-way clip, so ultralighters can mount it on a hat brim or shoulder strap and leave the band home, or replace it with shock cord. A small stuff sack in the box doubles as a diffuser for lantern duty.

Durability. The body is mostly polycarbonate and feels solid in the hand. IP66 covers rain and hose-down splashes, not submersion, and the 1 m impact rating is modest. One buyer reported a red LED that failed to light.

Pros & Cons

Pros

• 56 g with 600 lumens and 123 m of throw
• Warm, neutral and cool white in one lamp
• About $45
• USB-C charging in roughly 1.25 hours
• Removable clip system allows a sub-56 g setup
• Lockout mode and comfortable, breathable headband

Cons

• No mode memory; resets to low neutral each time
• Spotty beam with edge artifacts and no true flood
• Measured CRI of 68
• Built-in battery can’t be swapped
• Some owners report shorter-than-claimed runtime
• IP66 and 1 m impact rating are only adequate

Who Should Buy This

Thru-hikers and section hikers who want a single lightweight lamp that can both light up the trail and serve as a camp light will get the most from the NU27. It also suits trail runners who want throw without a battery pack on the forehead. Hikers who regularly walk many hours after dark, or who want a flood beam for camp chores, should look at a lamp with a larger battery or a dedicated flood mode. Anyone needing accurate color rendering should look elsewhere too. Hikers who only need a bare-minimum light for a few hours of camp use can save a few grams with the NU25, though they give up the extra output and the tint options.

Verdict

The NU27 delivers more light per gram than almost anything at its price, and the three color temperatures are useful rather than gimmicky. Its beam is not pretty and the interface forgets your settings, but neither flaw outweighs a 56 g lamp that throws 123 m for $45. It is an easy recommendation for the ultralight crowd.