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Outdoors head-to-head

Fenix HM65R-TvsNitecore NU25 UL

The 4 axes split 2-2 and the averages still land 8.3 to 7.6. Durability is the widest of them, 9.2 to 6.4.

Fenix HM65R-T

Fenix

8.3

Magnesium body, removable 18650, and enough throw to run singletrack at night.

Price and availability change constantly, so we don't quote them here — the link opens the current Amazon listing.

Nitecore NU25 UL

Nitecore

7.6

Forty-five grams with the cord on. You stop deciding whether to bring a headlamp at all.

Price and availability change constantly, so we don't quote them here — the link opens the current Amazon listing.

Where they diverge

The widest gap is Durability, Fenix HM65R-T ahead 9.2 to 6.4. They come closest on Value, 7.8 to 6.8. Left of center is Fenix HM65R-T, right is Nitecore NU25 UL.

Fenix HM65R-T versus Nitecore NU25 UL — axis scores out of 10Horizontal bar chart of editorial scores out of 10 across 4 axes. Bars for Fenix HM65R-T run left from the axis labels, bars for Nitecore NU25 UL run right. Fenix HM65R-T: Performance 9.4, Value 6.8, Durability 9.2, Design 7.8. Nitecore NU25 UL: Performance 7.0, Value 7.8, Durability 6.4, Design 9.2.Fenix HM65R-T (left)Nitecore NU25 UL (right)PerformanceFenix HM65R-T — Performance 9.4 out of 109.4Nitecore NU25 UL — Performance 7.0 out of 107.0ValueFenix HM65R-T — Value 6.8 out of 106.8Nitecore NU25 UL — Value 7.8 out of 107.8DurabilityFenix HM65R-T — Durability 9.2 out of 109.2Nitecore NU25 UL — Durability 6.4 out of 106.4DesignFenix HM65R-T — Design 7.8 out of 107.8Nitecore NU25 UL — Design 9.2 out of 109.2Editorial score out of 10 — higher is better

Which one to pick

Take the Fenix HM65R-T

Leads on Performance and Durability.

  • Night trail running, where seeing thirty meters ahead decides your pace
  • Search, night work, and anything that has to keep going past midnight
  • You already own 18650 cells and a charger, so spares cost nothing new

Take the Nitecore NU25 UL

Leads on Value and Design.

  • Counting grams, where the alternative is carrying no lamp at all
  • Camp light, cooking, and reading rather than covering ground fast
  • A backup lamp that lives in the lid pocket permanently

What each one gets wrong

Fenix HM65R-T

  • Weight on the forehead matters; this is the heavy end of the category
  • You want it to run at 1,500 lumens rather than step down to hold temperature
  • Simple is the goal — two buttons and separate emitters take learning

Nitecore NU25 UL

  • You want a battery you can swap or replace when it wears out
  • The lamp will be worn over a beanie or helmet on rough ground
  • You need the rated output to last, since 400 lumens is a short burst

Specs, side by side

SpecFenix HM65R-TNitecore NU25 UL
Max output1,500 lumens combined — 1,300 spot, 400 flood400 lumens
PowerOne 18650 cell included, or two CR123A—
BodyMagnesium alloy—
Water resistanceIP68IP66
ChargingUSB-C, about three hours—
Weight—45 g with the elastic cord
Battery—650 mAh sealed cell, USB-C
Max runtime—45 hours on the lowest setting

Rankings they both appear in

Questions

Fenix HM65R-T or Nitecore NU25 UL — which should I buy?
Fenix HM65R-T takes Performance and Durability; Nitecore NU25 UL takes Value and Design. Neither leads on more axes than the other, so it comes down to which of those you care about.
Is 0.7 a real difference?
Barely. Fenix HM65R-T averages 8.3 and Nitecore NU25 UL averages 7.6, and the total is the plain average of 4 axes, so 0.7 is what one axis moving 2.8 looks like after averaging. The axis split, 2-2, tells you more.
Which one ranks higher in "A headlamp's battery format constrains everything else"?
Fenix HM65R-T sits at #2 in "A headlamp's battery format constrains everything else", Nitecore NU25 UL at #4.