Built So the Light Doesn't Stop Before You Do.

Two practical advantages. First, the spare cell stays charged in your pocket — when the running cell runs low, you swap in 10 seconds with no tools. Second, hot-swapping in the field means you're not waiting for a charge cycle to finish. A larger single cell would mean more runtime per charge but no fallback when you've used it up.

Two 18500s also keep the lamp's centre of mass low and stable on the band. A larger cell would push weight forward and bounce on rough terrain. The two-battery design is what makes 90 grams ready-to-go possible without compromising runtime.

The lamp shuts off briefly during the swap — there's no internal capacitor keeping it lit between cells. The actual swap takes about 10 seconds: open the housing, lift one cell out, drop the next in, close. No tools.

If you need uninterrupted light during long efforts, plug a USB-C power bank into the lamp and the lamp keeps running on external power while you handle the swap separately. The lamp also charges the active battery from the same connection — useful when the day runs longer than expected.

Operating range is −25°C to +60°C. The aluminum heat sink handles cold without issue. Lithium cells lose capacity below roughly −10°C — that's true of every battery on the market — and with the cell on the lamp head, it's exposed to ambient temperature.

The two-battery system is the answer. Swap to the warm cell from your inner pocket when the running cell starts to weaken in deep cold. The cycle continues — running cell on the head, warm spare in your pocket. For sustained operation in extreme cold, the PRO 3100 is designed differently: external battery pack on a cable, kept inside your jacket. Different lamp for a different problem.

The PRO 1200's click-release headband lets you take the lamp off the band tool-free and snap it onto a hard hat bracket, chest rig, or any Stormlight accessory. Seconds, no tools. Built for professionals who move the lamp between mounts as the work changes.

The SPORT 1200 uses a fixed low-profile band instead — tighter against the brow, less bounce during fast movement, but no tool-free release from the band itself. Different priorities for different users. Both lamp heads have the same GoPro-compatible feet, so accessory mounting is identical between the two.

Same hardware platform, same 1,225 lumen output, same six white modes, same red circuit, same battery, same charging, same multi-charger compatibility. The differences are the headband and the warranty framework. PRO uses the click-release headband with white branding and operates under a separate warranty structure for professional and commercial use. SPORT comes with the fixed low-profile headband (black with yellow Stormlight branding) and a 2-year international consumer warranty.

Pick PRO if the lamp is a tool you depend on for paid work. Pick SPORT for personal sport, recreation, and adventure.

The biggest difference is what the lumen number actually means. Most lamps in this category are rated to ANSI/PLATO FL1 — the headlamp industry's measurement standard. FL1 measures output between 30 seconds and 2 minutes after activation, and defines runtime as the time until output drops to 10% of that initial reading.

That sounds reasonable until you understand what it allows. A high-output LED hasn't yet thermally throttled at the 30-second mark — it's still drawing peak current before the heat catches up. So a lamp can be marketed at one number while in practice it stabilizes at a much lower output within the first few minutes and runs at that level for most of the rated runtime. We've seen significant drops between the headline figure and what the lamp actually delivers once it's warmed up. Technically FL1-compliant. Practically misleading.

We measure differently. Our 1,225 lumens is the output the lamp delivers at operating temperature — once the LEDs have stabilized and the aluminum heat sink is doing its job — and it's the output we sustain across the rated runtime. Same for every other mode. The number you read on the box is the number that hits the work site.

The other concrete differences:

Aluminum heat sink at the rear. This is what lets the lamp hold its rated output. A polymer front for impact resistance, aluminum at the rear pulling heat away from the LEDs. The lamp is built to deliver the lumens it claims for the duration it claims them.

Two batteries in the box. Most competitors include one battery and sell the second separately. We include two from day one — one running, one waiting. The whole point of a swappable system collapses if you only ship one cell.

Repairability. Every part is user-replaceable — the battery, the lens, the switch, the headband, the mount feet. No soldering, no proprietary screws, no service centre. Ten-year part availability on every model we ship.

You can find lamps with bigger headline numbers for less money. We don't compete on that. We compete on what those numbers actually deliver in your hand at the third hour of a shift, in the rain, when the cell is half-spent.

Email us with what's wrong. We send you the replacement part with simple instructions. Most repairs are user-completable in under five minutes — no tools required for the cell, the headband, or the mount feet.

If the failure is something you don't want to handle yourself, you ship the lamp to us and we handle it. No service-centre network, no authorised repair shops. One channel, direct.

Parts are guaranteed available for ten years from the model's launch. More about repair →

Yes. The lamp head has GoPro-compatible feet built in, so any standard GoPro mount — helmet adapter, handlebar mount, chest rig — works out of the box. The click-release headband releases the lamp tool-free for swapping between mounts in seconds.

For mounting on Stormlight's own click-release accessories, our spring-loaded receivers grip the same GoPro-compatible feet and won't release on impact or vibration. Same feet on the lamp, better receivers on the accessories.

Helmet brackets, hard hat brackets, handlebar adapters, and additional accessories are coming this autumn.

Yes, in carry-on. Each 18500 cell is roughly 2,600 mAh at 3.7V — about 9.6 Wh per cell, around 19 Wh for both. Well under the 100 Wh limit for lithium-ion batteries in cabin baggage on every major airline. Always pack lithium batteries in your carry-on, never in checked luggage — that's the rule for any lithium battery, not specific to ours.

Worldwide air shipping, 2–7 days to most destinations. All duties and import taxes are included in the price you see at checkout — nothing extra to pay on delivery.

14-day return window from the day the lamp arrives. If something's wrong or it's not what you expected, ship it back and we refund in full.