I’ve reviewed a bunch of Nitecore lights, but somehow this little headlamp slipped under the radar. Nitecore reached out, and soon this diminutive three emitter, high CRI, lightweight headlamp was in my hands! This is my kind of light, so I’m interested to see if it’s any good!

Official Specs and Features

Here’s a link to the official product page.

Versions

As far as emitters go, there’s only one version of the NU25. But there are three body colors, and two headband colors. There’s black (seen here), yellow (which also has a black band), and white, which has a white band).

Price

These go for $36.95, and may be purchased at NitecoreStore.com.

Short Review

This is a very fun little light. I like the versatility offered with the emitter choices, and as a lightweight headlamp it’s a good pick. There are even some mods to make it lighter weight, too!!

Long Review

The Big Table

And just a few facts about the High CRI emitter, though most of this will be blanks…

* Standard measurement disclaimer: I am an amateur flashlight reviewer. I don’t have $10,000 or even $1,000 worth of testing equipment. I test output and such in PVC tubes!! Please consider claims within 10% of what I measure to be perfectly reasonable (accurate, even).

What’s Included

Nitecore NU25 Headlamp

Headband

Charge cable (USB to micro-USB)

Manual

Package and Manual

The light is packaged in a blister pack, with an easy open cut line at the bottom. It gives a good display of the product and included items.

Here’s a link to the pdf manual.

Build Quality and Disassembly

The NU25 has a well-built feel, but is still quite light (ie often very light stuff feels cheap, but this doesn’t).

The headband attachment is very easily removable, and doesn’t leave too many remnants on the light itself. Really just the two circles on the sides, and two ratchet points on the back. I think that probably leads this to be very 3d-mount print friendly!

The back has a honey comb design, likely a weight-saving consideration. But since that area will be resting on the headband, which will be on the forehead, it’s also a good sweat exit point.

The halves of the NU25 appear to be ultrasonically welded, so I did not disassemble the light.

Size and Comps

Length 55.5mm

Head Size 55mm

Weight 28g

This headlamp is quite small. A bonus fact about this light that I’ll cover more later is that it can be powered though all the modes from the microUSB port. So it’s possible and reasonable to power it with a battery pack (making the small cell size almost irrelevant.)

Retention and Carry

The light comes attached to this base, which is the connection point to the headband. But don’t discount this base – the light pivots in it and for certain applications this is a nice item.

That clip is also extremely close to being a functional belt clip, too. I tried it and it works fine but it’s not technically secured to the belt.

But of course primarily it’s a headlamp. The included headband is nice. It’s thick, and there’s a small silicone band for gripping the forehead. This doesn’t go all the way around the headband.

Power and Runtime

This light is powered by a “2.26Wh” internal lipo battery. I didn’t take the unit apart, so I didn’t see the cell. The cell is not replaceable, but is rechargeable.

I did two runtimes. Turbo and High. First is turbo – output is over 400 lumens initially but drops off pretty quickly. In my test the light never shut off, but was well below 10% of 30s output when I stopped the test.

The High runtime looks very similar, and also never shut off. Output starts a little lower than Turbo, and drops off a little less dramatically, but still the drop is severe.

I didn’t runtime for the High CRI emitter, because the output is too low for any sort of good graph. And the red is very bright (and probably runs a little hot), but my sensor isn’t sensitive to red.

There isn’t any LVP. It’s possible to check the battery level, but only when the light is off.

Recharging happens over a micro-USB port. The port is covered by a thin strip rubber (probably really silicone) cover. This cover stays in place well, and is a little hard to get out of the opening.

A cable is included, and like most Nitecore cables, is a very nice cable. There’s a velcro loop to keep it bound up if so desired.

These two charge graphs look different, most likely because of how far the cell was discharged during the runtime tests. Charging is fairly good, and more or less confirms the 2.26Wh claim Nitecore makes about the cell.

PWM

For reference, here’s a baseline shot, with all the room lights off and almost nothing hitting the sensor.

There’s no noticeable PWM on any of the modes or white emitters. (Again, I wasn’t able to test red, but it didn’t appear to have PWM.)

User Interface and Operation

There are two buttons on the top of the NU25. Both e-switches, both moderately clicky with very low travel, and both indicating switches (though they seem to indicate from the same emitters, not individually). One is labeled with a power symbol, and the other with an “R.”

Unsurprisingly the “R” switch controls the red emitter, and the other controls both white emitters.

Here’s a UI table!

State Action Result Off Click Power Button (PB) Main Emitter On (low) On (Main) <3s Click PB Main Advance (LMH Off) On (Any) >3s Click PB Off On (Any) Hold R Off Off Hold PB Aux White Aux White Click PB Low Main Off Click R Red Low Red Low <3s Click R Red Advance (Low High Caution) On (Any) Hold PB Turbo (Main emitter) Off (but not locked) Hold PB >3s SOS SOS Click PB (within 3s of clicking for SOS) Beacon Any Long Press Both Switches together Lockout (Click switch – red blink indicates lockout) Lockout Long Press Both Switches together Unlock Off Hold R Power indicator*

* Power indicator

3 flashes = battery >50%

2 flashes = battery <50%

1 flash = battery <10%

LED and Beam

The main emitter is a Cree XP-G2 emitter with a lightly orange peel reflector. The other two -a red and a High CRI are unspecified. The High CRI is a larger rectangular either though, and a little unusual.

These beamshots are always with the following settings: f8, ISO100, 0.3s shutter, and manual 5000K exposure.

Tint vs BLF-348 (Killzone 219b version)

I compare everything to the Killzone 219b BLF-348, because it’s inexpensive and has the best tint!

Random Comparisons and Competitive Options….

Here’s a link to a relevantly filtered page on parametrek.com. I use that site a lot!

It’s all Nitecore items!!

Conclusion

What I like

Multiple useful emitters

Pretty good UI

Very small

Can be powered from battery pack

What I don’t like

A magnet would be nice

The headband working properly as a belt clip would be even nicer

Notes

This light was provided by Nitecore for review. I was not paid to write this review.

This content originally appeared at zeroair.org. Please visit there for the best experience!

Whether or not I have a coupon for this light, I do have a bunch of coupons!! Have a look at my spreadsheet for those coupons. It’s possible to subscribe and get notifications when the sheet is edited!!