Fenix HP12RT Review: A Trail Running Head Torch Built for Dark Winter Nights

Introduction

Winter running always arrives with the same routine: dig out the warm layers, charge the batteries, and hope your head torch is still up to the job. The Fenix HP12RT is the brand’s newest trail running head torch, and after a couple of months of testing it has made a strong case for itself. It takes a fresh approach with a split design that separates the light unit and the battery pack, spreads weight more evenly across the head, and adds a rear safety light that runners have been asking about for some time.

Who This Head Torch Is For

The HP12RT is aimed at trail and ultramarathon runners who regularly train or race after dark. If you have ever been caught out in heavy rain or dense fog with a basic head torch that seemed to vanish into the murk, the dual-beam setup here will feel immediately useful. It is also a good fit for anyone who values dependable build quality and a battery that lasts through long nighttime sections without a recharge mid-run.

Construction and Comfort

The main light unit is machined from high-grade aluminium, which keeps weight low and helps with heat dissipation, an important detail on a torch this powerful. The rear battery pack uses durable plastic with a metal liner, and the whole thing feels very well manufactured.

The head strap is elasticated and fully adjustable, made from soft perforated fabric for breathability, with high-visibility detailing for safer nighttime running. A silicone gripper at the front helps stop the torch from shifting while you run. The total weight with the light unit and rechargeable battery is 201g, roughly 60g heavier than Fenix’s HM65RT, but because the weight sits at both the front and back of the head, it actually feels lighter once you are out running.

One trade-off worth knowing about: the split design means this model does not get the boa-style adjustment wheel found on some other head torches in the Fenix range, which made on-the-move micro adjustments easy. It is an understandable omission given the layout, but some riders will miss it.

Features That Matter on the Trail

The HP12RT packs in an unusually complete feature set. The standout is the dual lighting output: a standard white beam for normal running, plus a neutral white beam that penetrates far better in heavy rain or fog. Both can be used individually or combined, controlled by large textured buttons on top of the head unit.

Because the battery now sits at the back, Fenix added a red LED safety light on the rear of the battery case, with constant and flashing modes. There is also a red proximity light for use around groups, which doubles as an SOS mode flashing in Morse code. A quick press of the power button shows remaining battery life on an indicator at the back.

Further details include 60 degrees of head-tilt adjustment, an intelligent memory circuit that recalls your last used output, and overheat protection that lowers output if the unit reaches 60 degrees C. Two lockout features, one electrical and one mechanical button guard, prevent the torch from switching itself on inside a running vest and draining the battery. The unit is drop tested from 2 meters and carries an IP66 waterproof rating, so tough weather is not a concern.

Performance and Battery Life

The white beam offers four modes: 5 lumens low, 70 lumens medium, 350 lumens high, and a 1,000-lumen turbo burst for emergencies. The neutral white beam offers 70, 200, and 500 lumens, and combined mode reaches a maximum of 1,300 lumens with a claimed 200m beam length. In practice, the 350-lumen high setting on the white beam feels like the sweet spot for most running.

Fenix quotes around 16 hours of burn time at that setting with a 98m beam length, tested under lab conditions. In real-world use, expect closer to 10 to 12 hours before a recharge is needed, which is still a genuinely good result. Charging is simple via the included USB-C cable and takes roughly 3 hours from empty to full with the 4,000mAh rechargeable battery.

Buying Advice

At £99.95 on the Fenix website in the UK, the HP12RT sits at the upper end of the running head torch market, but it backs that price with a 5-year warranty, a 1-year warranty on the rechargeable battery, a spare O-ring, and an unusually thorough feature set. If you mostly run short, well-lit routes, a cheaper torch will do. If you regularly head out for long nighttime trail sessions or ultramarathon training through winter, the split design, dual beams, and rear safety light earn their place.

Conclusion

After two months of testing, the HP12RT has done enough to replace a long-trusted favourite. The build quality is excellent, the split design makes the extra weight a non-issue, and the neutral white beam is one of those features you do not realise you need until you have run with it in fog. Fenix has produced another very capable trail running head torch, and one that clearly reflects what runners have been asking for.