Sofirn LT1S Review: A Lantern That Doubles as a Waterproof Power Bank

Introduction

The Sofirn LT1S is a camping lantern that manages to stand out in a category full of lookalikes. It is not a huge light, but it is very dense, and it packs features that are hard to find elsewhere in this form factor: a user-swappable 21700 battery, USB-C reverse charging, red light output, and an IPX8 waterproof rating. After spending time with it, the impression is that there is very little fluff here. Almost everything on the body serves a purpose.

Who This Product Is For

This is a lantern, so it suits campers, base camp setups, and anyone who needs area lighting rather than a spotlight. The included hanging hook also makes it a plausible addition to a car kit, where it can be set up to throw a lot of light for work around the vehicle, such as under the hood. It is arguably heavier than it needs to be for casual use, so it fits true base camp scenarios best, but the feature density is hard to argue with.

Swappable Battery and Charging

The standout design choice is the large tail cap at the bottom, which houses a 5,000 mAh 21700 cell. Any standard 21700 can be swapped in, which is a big deal: you can keep a spare charging on a bay charger and trade cells whenever needed, and you replace a battery instead of the entire light down the line. Non-proprietary power is a very positive trait that is rare in any lamp setup.

USB-C charging is built in, and the LT1S also supports reverse charging. With a USB-C to USB-C cable, it works as a power bank for a phone, automatically switching into charging mode in software. The 5,000 mAh capacity is enough to give most phones a substantial emergency top-up, which matters when there is no wall outlet around.

Waterproofing and Everyday Reliability

The LT1S carries an IPX8 waterproof rating, which is uncommon for lanterns of this type. That rating matters more than it first appears: a bag can fall off a canoe, weather can turn, and a lantern that doubles as a battery source should not die the first time it gets soaked. Having a waterproof light that also acts as a power bank means your emergency charging source is safe in wet environments.

One small wish: a spare silicone cap for the USB-C port would be a welcome addition, since a spare port cover is a simple credibility win for any sealed electronics.

User Interface

The interface is a genuine highlight. Sofirn took a fuller-featured UI and simplified it down to only what a lantern truly needs, and the result is layered but logical:

• One press turns it on and briefly shows the remaining battery level via an indicator.
• Hold from off to start on the lowest output.
• Double press from off activates Turbo at up to 500 lumens.
• While on, hold to cycle through the main modes.
• Triple click toggles red light mode.
• Double press while on switches which half of the lantern emits light: one side, the other side, or both.
• Press and hold to adjust color temperature, from a warm 2700K setting that is easier on the eyes for reading, up to a cool white that throws farther.
• Four presses while on toggles between stepped and ramping mode, letting you dial in a precise output; a small flash marks the top or bottom of the ramp.
• Four presses from off engages lockout, with a blink to confirm.

It is complicated on paper, but nearly everything is reachable without guesswork, and the customization is excellent. With 18 white LEDs plus additional red emitters, there is a lot of flexibility packed into a compact package.

Design and Build Quality

At 335 grams, close to 12 ounces, the LT1S feels like nothing but electronics and density. The black portions of the body are aluminum rather than plastic, paired with a hard opaque plastic diffuser. There is zero flex to the body; it is a genuinely tough little lamp. Spare O-rings are included in the box, and the hanging hook clicks securely into place and stays put, a small detail executed well.

Things to Consider Before Buying

The weight is the main trade-off. At this density, it is better suited to base camp or vehicle-based use than ultralight backpacking. The feature set also goes beyond what many people will ever need, though anyone who does use it will likely appreciate the depth. Finally, confirm the exact LED specs for yourself if high CRI output is a priority for your use case.

Buying Advice

If you want a lantern that also covers emergency phone charging, supports battery swaps for indefinite runtime, and offers a genuinely well thought out interface, the LT1S is an easy recommendation. If you need something lighter for backpacking, look elsewhere; this one earns its keep at camp or in the car.

Conclusion

The Sofirn LT1S nails the details that matter: a swappable 21700 battery, reverse charging in a waterproof body, red light, adjustable color temperature, and a UI that feels purpose-built for a lantern. It is heavy for its size, but there is very little fluff in what it offers, and it sets a high bar for what a modern camping lantern can be.