Nitecore NU43 review

Buy the NU43 if you want the most stored energy per gram you can carry on your head. Nitecore publishes a 3,400 mAh cell in a 116 g lamp, which works out to 10.8 watt-hours per 100 grams - the best ratio of any product on this site, ahead of the Fenix HM75R's 9.4. It also publishes 1,400 lumens, 130 m, 3,800 candela, IP68 and a 2 m drop rating. What it does not publish is a runtime for the 1,400 lumens it is sold on, and two of its figures disagree with each other.

We have not tested this headlamp. We own none of the products on this site, we have no laboratory, and nothing here is an impression of how it sits on a head. This review takes every figure Nitecore publishes, runs the arithmetic those figures allow, and says what they do and do not commit the company to.

It also corrects us, and the reason is embarrassing in a useful way. Until today this site recorded the NU43's beam distance, candela, runtime, weight and ingress rating as not published, and said in several places that Nitecore states "output and charging" and nothing else. All five are published, and have been, on Nitecore's own product page. We found it by reading nitecore.com/sitemap.xml - the habit we picked up correcting the P30i a week ago, when the same mistake turned out to be a guessed URL rather than a silent manufacturer. Every page that described those figures as gaps has been corrected in the same change as this one.

The published specification

Sixteen published figures and three named gaps. That is a better sheet than this site credited Nitecore with for any headlamp, and it puts the brand in a different position in our headlamp brand ranking than its reputation here suggested.

The number that makes this lamp interesting

Nitecore publishes a cell capacity, which most headlamp makers do not, and that makes the lamp comparable on the measure this site uses across the whole category: how much stored energy you carry for each gram on your forehead.

That is a genuine engineering result rather than a marketing one, and it is the reason to consider this lamp over the obvious European alternatives. It is also the figure that makes the 1,400-lumen headline plausible in a body this size: the emitter is being fed by a cell with real capacity behind it rather than by the small pack a 116 g lamp usually carries.

Two published figures that do not reconcile

Under ANSI FL 1, beam distance is defined as the point where illuminance falls to 0.25 lux. That fixes an exact relationship between distance and peak intensity, so when a maker publishes both, the two numbers check each other. Nitecore publishes both here, and they do not check out.

What makes this worth a section rather than a footnote is that the same company gets it exactly right elsewhere. Nitecore publishes 1,000 m and 250,000 cd for the P30i, and those reconcile to the digit. So this is not a company that cannot measure candela - it is one product's sheet with a loose number on it. If you are choosing between these two figures, the conservative one is 123 m, and nothing on this page depends on the difference.

The beam: the widest we compute anywhere

Whichever candela figure you take, the ratio that describes the beam is unambiguous, and it is at the extreme end of everything on this site.

So the 1,400 lumens are being spread, not aimed. That is the correct choice for a head-mounted lamp - a tight hotspot bobs with every step and leaves the verges black - and it is the wrong choice if you need to identify something at the end of a field. A Fenix HM75R publishes 223 m from 1,600 lumens, at 7.8 candela per lumen, and is the lamp to want if reach matters. Throw versus flood sets out the trade, and the brightest headlamps ranks the whole category on this figure rather than on output.

Runtime: two honest points, and the one that is missing

Nitecore publishes no per-mode runtime table, which on a five-level lamp is the real gap on this sheet. What it does publish, between the spec block and its own FAQ, is two output-and-runtime pairs - and two points are enough to learn something.

And the gap: there is no published runtime for 1,400 lumens. Nitecore's own FAQ names 8 lumens and 100 lumens and stops, which is the politest possible version of the omission this site complains about across the category. A 1,400-lumen headline with no duration beside it describes a burst, not a working level, and on a 12.6 Wh cell it cannot be a long one. How runtime is defined covers the standard both published figures are measured under.

Durability, and the one line that matters in winter

Nitecore publishes IP68, stated as 2 m submersible, plus a 2 m drop rating. Under IEC 60529 the 6 is dust tight and the 8 is continuous immersion to a depth the maker specifies, which makes this the joint-strongest ingress rating of any headlamp we cover alongside the Fenix HM65R-T - and stronger than the IPX4 that Petzl publishes across the Tikkina, Tikka and Actik Core.

Nitecore also describes the housing as a PC rear shell with a stamped aluminum alloy front, and calls it low-temperature resistant. That last phrase is a claim rather than a figure - no operating-temperature range is published - so we record it as what it is. If cold is the deciding factor, the thing that actually governs a sealed lithium-ion lamp in winter is that it must not be charged below freezing, which is a chemistry constraint no housing fixes; flashlights in the cold sets out the published cell data behind that.

The integrated cell is the real catch

Nitecore is unusually direct about this in its own FAQ: the NU43 "uses an integrated 18650 battery", which it frames as breaking the design limitations of conventional 18650 headlamps. The engineering argument is fair - that is how 12.6 watt-hours fits in 116 grams - but the consequence for a buyer is the same as every sealed lamp. When the cell degrades, the lamp is finished, and Nitecore publishes no charge-cycle figure to tell you when that is.

That is worth weighing against makers who do state it: Petzl publishes three years or 300 cycles for the Swift LT, and Maglite publishes 1,000 cycles for the ML150LRX. It is also the argument for a hybrid lamp if your use case is multi-day - the Petzl Actik Core takes three AAA cells when its pack dies, at the cost of less than half the energy density.

What Nitecore still does not publish

No per-mode runtime table. Five brightness levels, two published durations. No CRI figure, which matters on a lamp with a dedicated flood for close work - only two lights on this site publish one. No charge-cycle life, on a lamp whose battery is not replaceable. No candela or runtime for the red mode, so it is listed as a feature rather than a measured output.

None of those is unusual, and all of them are the difference between this and a Streamlight sheet. What is unusual is how much Nitecore does publish here, and the practical lesson for anyone reading spec sheets is the one this review started with: a missing figure is often a missing page rather than a silent manufacturer.

Who should buy something else

Skip it if you need reach. 2.7 candela per lumen is the widest beam we compute. The Fenix HM75R publishes 223 m and 7.8 candela per lumen on comparable output, and the Fenix HM65R-T 170 m.

Skip it if the lamp must survive a flat battery. There is no cell to swap. The Petzl Actik Core, the Petzl Tikka and the Petzl Tikkina all take three AAA cells and publish full tables for them.

Skip it if you want to know what the headline costs. No runtime is published for 1,400 lumens. If that figure is the reason you are buying, the honest position is that nobody has told you how long you get it for.

Skip it if grams are the only criterion. 116 g is light for the energy, and it is not light in absolute terms: the Streamlight Bandit Pro publishes 45.4 g and the Petzl Swift LT 43 g. This lamp wins the ratio, not the raw number. See headlamps for running, where raw weight decides it.

The verdict, stated as what it commits to

Nitecore commits to 1,400 lumens, 130 meters, 3,800 candela, a 3,400 mAh cell, 116 grams, IP68, a 2 m drop rating, a 2-hour USB-C charge, 165 hours at 8 lumens and 29 hours at 100 - and the arithmetic on top of that gives the best energy-to-weight ratio on this site, at 10.8 watt-hours per 100 grams. For a general-purpose rechargeable lamp for camping, trail walking or anything where you want a wide, bright flood and a long low mode, that is a strong sheet at a price well under the European brands.

What it does not commit to is a duration for its own headline output, a per-mode table, a CRI figure or a cycle life - and its published distance and candela do not agree with each other, which the same company manages correctly on the P30i. Buy it for energy density, weather sealing and a wide beam. Buy something else if you need reach, a battery you can replace, or a number for the 1,400 lumens. For the category ranked on what each maker actually prints, see headlamp brands compared.