Nitecore NU25 MCT Review
A detailed review of the Nitecore NU25 MCT ultralight headlamp, featuring multi-color temperature LEDs, 400 lumens, and a 700mAh built-in battery — all in a 50g package.
Overview
The Nitecore NU25 MCT is the third generation of what has become one of the most trusted ultralight headlamps in the thru-hiking community. The Trek calls the NU25 the all-around best headlamp for thru-hikers, and this third-gen MCT UL builds on that reputation with three color temperatures and a battery Nitecore claims lasts 25 percent longer on its 6-lumen ultralow setting. The headline upgrade this time around is the MCT (Multiple Color Temperature) system, which lets you switch between warm, neutral, and cool white light — a genuinely useful feature, not just a spec sheet novelty. The standard NU25 MCT weighs 1.76 ounces (50 grams), while the UL version shaves that to 1.66 ounces (47 grams) by swapping the solid headband for a cord strap. This review covers the standard MCT with the solid headband.
Key Specs
| Spec | Value |
|---|---|
| Weight | 50 g (1.76 oz) |
| Dimensions | 60.0 × 34.4 × 27.2 mm |
| Max Output | 400 lm |
| Brightness Levels | Ultralow (6 lm) / Low (60 lm) / Mid (200 lm) / High (400 lm) |
| Max Beam Distance | 132 m |
| Max Beam Intensity | 4,351 cd |
| Max Runtime | 45 hrs (Ultralow) |
| Runtime at High | ~2.5 hrs |
| Battery | Built-in 700 mAh Li-ion |
| Charge Time | ~1 hr 15 min (USB-C, 5V/0.5A) |
| Color Temperatures | 3000K Warm / 4500K Neutral / 6500K Cool White |
| Auxiliary Light | Red (2 levels) |
| Special Modes | Location Beacon, SOS, Slow Flashing |
| IP Rating | IP66 |
| Impact Resistance | 1 m |
| Price | ~$36.95 |
Performance
Beam & Color Temperature
The MCT system is the biggest design shift from prior NU25 generations. The original NU25 had two LEDs — one for throw, one for flood — both with the same color temperature. The MCT drops the separate spot/flood option entirely; both LEDs are always active together. The combined beam is a hybrid of flood and throw, but leans a bit more toward throw. The two TIR optics let you choose between cool, neutral, or warm white. That’s a real trade-off worth knowing: if you relied on the previous gen’s wide flood mode for campsite tasks or close-up reading, the MCT’s beam character is noticeably more directional.
On the color temperature side, the 3000K warm light excels in fog, rain, and snow by reducing glare and backscatter; 4500K neutral white is a versatile, natural light for most conditions; and 6500K cool white delivers bright, crisp illumination that works well for extended night hiking. In practice, the warm setting earns its keep on rainy shoulder-season nights — fewer halos, better contrast on wet trail surfaces. The 6500K is noticeably punchier and the one you’ll want when you’re pushing miles after dark. The beam covers a 100° wide illumination angle with a peak of 400 lumens and a maximum throw of 132 meters.
One honest caveat: the NU25 MCT does not offer a high-CRI option — the LEDs measure at low CRI across all three color temps. For camp chores or map reading, that’s fine. For anything requiring accurate color rendering — identifying plants, assessing a wound — you’ll notice the difference compared to a high-CRI option.
Battery & Charging
The NU25 MCT is powered by a built-in 700 mAh lithium-ion battery with a maximum runtime of 45 hours, and charges fully in 1 hour and 15 minutes via the built-in USB-C port. That 700 mAh capacity isn’t large, which is why sustained high-output runtime is relatively short. The 45-hour figure is real but lives at the 6-lumen ultralow setting — fine for stumbling to the privy at 2 a.m., not useful for hiking technical terrain. At high (400 lm), you’re looking at roughly 2.5 hours. Plan accordingly on multi-day trips without power access.
The NU25 has a four-LED battery meter on the top of the unit — a quick press of the power button when the light is off shows your remaining charge. Charging is via USB-C, and all four indicator LEDs illuminate when fully charged. The non-replaceable battery is the one long-trip vulnerability: if it dies in the field, that’s that. Carry a small power bank and top up every night or two on extended trips.
Fit, Comfort & Build
The torch body is hard polycarbonate housing a four-LED array: twin spot/flood MCT LEDs and two red-light LEDs. Despite its size, it’s a robust bit of kit with an IP66 rating — completely dustproof and rainproof. In one test, the headlamp was taken down to 22°F and woke up covered in condensation — and worked perfectly through it.
The NU25 MCT features five-step tilt adjustment with the chosen position staying put even when your head is moving. The main light body can also be removed from the bracket and used as a handheld flashlight — handy for finding gear at the bottom of a pack or reading in the tent. The headlamp also ships with a diffusing stuff sack that doubles as a lantern when the headlamp is turned on and stuffed inside. That’s an unexpectedly practical bonus for tent living.
Controls & UI
Two buttons manage the whole system: four levels of primary white light, three special modes (SOS, Beacon, Slow Red Flashing), and two levels of auxiliary red light. The two buttons are noticeably different in size, which makes it easier to identify which you’re pressing without looking. That’s a real improvement over earlier generations. Still, mastering the full array of functions takes some practice, and first-time users should read the manual before heading into the backcountry. The buttons can also be fiddly with gloves — something to consider if you’re doing a lot of cold-weather hiking.
To prevent accidental activation, the NU25 MCT has an electronic lockout mode. Long-pressing both buttons simultaneously locks the light, and the beam flashes three times to confirm lockout; pressing any single button during lockout produces one flash as a reminder.
Pros & Cons
Pros
- At 50g with the standard headband, it competes with almost nothing else at this feature level
- Three color temperatures are genuinely useful, not gimmicky — warm light in rain and fog is a legitimate performance difference
- Charges from empty in 1 hour and 15 minutes — fastest charge in class for a light this size
- IP66 keeps it running through rain, dust, and condensation
- Included diffusing stuff sack doubles as a tent lantern
- Two distinctly sized buttons improve heads-on usability over earlier NU25 generations
- Detachable light body adds flexibility as a handheld torch
- Strong value at ~$37
Cons
- No high-CRI option — all color temps deliver low CRI
- 700 mAh battery limits high-output runtime to ~2.5 hours; requires disciplined power management on longer trips
- The separate spot/flood beam option from previous generations is gone — the MCT beam leans throwy
- Button controls become awkward with gloves
- Non-replaceable internal battery is a field failure point with no workaround
- The USB-C port rubber cover can be difficult to reseat fully once opened — a minor but recurring annoyance
- UI complexity requires a manual read before your first night out
Who Should Buy This
The NU25 MCT is built for hikers and runners who value simplicity, comfort, and reliability without unnecessary weight — a lamp that practically disappears on your head until you need it. It’s the obvious choice for thru-hikers and ultralight backpackers who want a sub-2 oz rechargeable with more beam flexibility than a basic single-temperature light. The warm-white mode makes it a better all-conditions tool than most competitors at this weight. It also makes an excellent backup headlamp on longer expeditions due to its low weight. If you regularly need high output for extended technical night hiking (3+ hours), you’ll want to pair it with a power bank or look at a heavier lamp with a bigger cell.
Verdict
The NU25 MCT is the lightest and longest-lasting generation in the NU25 lineup, and after three well-regarded generations, that’s saying something. The MCT color temperature system is the most meaningful spec upgrade in this version — the 3000K warm mode in rain and the 6500K punch for night hiking aren’t marketing fluff. The trade-offs are real (low CRI, short high-output runtime, no field-swappable battery) but they’re the same trade-offs you accept with any sub-50g light. At around $37, the price-to-performance ratio is hard to argue with. Rating: 8.5/10.