Petzl Swift RL review: the reactive, lightweight all-rounder

Who it's for

The Petzl Swift RL is the reactive, lightweight all-rounder in this head torch cluster. It is built around one idea: at 92g, it is the lightest torch here, and it thinks about brightness so you do not have to.

That combination points at a specific user. If you run trails, move fast on long days, or count grams on a summer overnight, a torch you barely feel on your head is a real advantage. And if you would rather look where you are going than fiddle with modes, the reactive sensor does that job for you.

It is not the torch I bought for myself. For solo winter navigation in the cold and wet, I chose the Fenix HM65R V2.0 and its cold-swappable battery and heavier armour. But the Swift RL was one of the alternatives I weighed up carefully, and for a lot of hikers it is the better fit.

If you want fire-and-forget lighting in the lightest package here, this is the one to look at. If you want a rugged, submersible torch you can feed fresh cells to on a freezing night, read the cons section first.

Specifications

Max output

1200 lumens (ANSI/FL1)

Max beam distance

168m

Signature feature

Reactive Lighting: ambient-light sensor auto-adjusts brightness, plus a Boost mode for a few seconds of max output

Battery

Rechargeable 2250mAh lithium-ion, USB-C, around a 5-hour charge, built in

Water resistance

IPX4 (weather and splash resistant, not submersible)

Weight

92g (the lightest torch in this cluster)

Runtime

Around 7 hours at a standard level, longer in reactive mode

Reactive lighting explained

Reactive Lighting is the Swift RL's headline feature, and the reason to buy it over a simpler torch. A small sensor on the front of the unit reads how much light is bouncing back at you and adjusts the output on the fly.

Look down at a map and it dims, so you are not blinding yourself off a white page. Lift your head to scan the trail ahead and it ramps back up to reach into the dark. You do not press anything. The torch reads the scene and sets the level.

There is a practical payoff beyond convenience. Because the torch only spends full power when the scene actually needs it, reactive mode stretches the runtime. Petzl quotes around 7 hours at a standard level, and longer in reactive mode, precisely because the sensor keeps dialling the output back when it can.

When you do want everything at once, there is a Boost mode that fires the full output for a few seconds: enough to pick a line across a black field or check a distant marker, without committing to that drain for the rest of the night.

Independent reviewers rate this system highly. Live for the Outdoors named the Swift RL its Gear of the Year 2024 and praised the reactive mode for "only pumping out the illumination when it's needed," which both saves battery and keeps you from dazzling yourself on close work. That matches the design intent: the sensor is doing the mode-switching you would otherwise do by hand, and doing it faster.

Why you would pick it over the Fenix

The Fenix HM65R V2.0 is the hero of this cluster, and the torch I chose. So why would you go the other way and pick the Swift RL? Two reasons, and they are strong ones.

Weight. The Swift RL is 92g. The Fenix is 144g. That is a 52g gap, and on a fast day, a long run, or a summer overnight where you are watching every gram, you feel it. The Fenix carries its battery in the front housing, so its weight sits on your forehead. The Swift RL is simply lighter, front to back.

Fire-and-forget lighting. The Fenix asks you to choose: spot, flood, red, and to click between levels as the ground changes. The Swift RL's reactive sensor makes those calls for you. If you would rather keep your hands on poles and your eyes on the trail than manage a torch, that is a real, everyday advantage.

Put simply: the Swift RL is the reactive, lightweight all-rounder, and the Fenix is the rugged cold-weather specialist. If your nights are about moving light and fast rather than surviving deep cold and wet, the Petzl is the more natural choice.

The honest cons

The Swift RL loses to the Fenix in three places, and they are the reasons I did not choose it for my own winter.

IPX4, not IP68. The Swift RL is weather and splash resistant, so rain and spray are fine. But it is not submersible. The Fenix's IP68 rating means it will survive being dropped in a stream or a bog. If your worst-case is a torch going underwater, the Petzl is the weaker bet.

A sealed battery you cannot swap. The 2250mAh cell is built in and charges over USB-C in around 5 hours. That is clean and simple at home. In the field, in the cold, it is a limitation. The Fenix takes a removable 18650 you can swap for a warm spare, plus 2x CR123A lithium cells as a cold backup, and lithium primaries keep working in temperatures that flatten a rechargeable. On a freezing night far from a socket, that matters. With the Swift RL, what you charged is what you have.

Less raw power. 1200 lumens and a 168m beam is plenty for trail running and general night walking. But it is not the Fenix's league for reach when you are picking a line off-path in the dark. If you want maximum throw in reserve, the Petzl is not the tool.

None of this makes the Swift RL a worse torch. It makes it a different one, tuned for light and reactive use rather than cold-weather ruggedness.

Verdict

The Petzl Swift RL is the reactive, lightweight all-rounder of this cluster, and it earns that billing. At 92g it is the lightest torch here, its Reactive Lighting takes mode-switching off your hands, and 1200 lumens with a 168m beam is more than enough for trail running and night walking. Independent reviewers consistently rate it near the top of its class, and I have no reason to argue.

A note on how I am assessing it: this is a specs-and-reputation review, built on Petzl's published figures and clearly-attributed independent testing, not a trail report of my own. I did not field-test this torch. I chose the Fenix HM65R V2.0 instead, for its cold-swappable battery and IP68 ruggedness on solo winter nights.

But that was my brief, not yours. If your nights are about moving fast and light, and you want a torch that sets its own brightness and stays out of your way, the Swift RL is the smarter buy of the two. Just go in clear on the trade-offs: IPX4 rather than submersible, and a sealed battery with no cold field swap.

For fast-and-light users and anyone who wants fire-and-forget reactive lighting, it is an easy torch to recommend.