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x850 Flashlight Kit
The X850 is your go-to lightweight workhorse. We took our reliable X800 and squeezed out an extra 50 lumens — all without adding bulk. It’s designed for helmet mounting, everyday use, and those times when you want a powerful beam without carrying a torch. Kept rugged, kept simple, built to serve.
Why We Built It
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Weight & mounting priority: We heard from riders — “give me brightness, but don’t make me carry a tank on my helmet.” So the X850 sits in the sweet spot: light enough for helmet mounting, yet powerful enough for real tasks.
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Incremental upgrade over X800: Rather than reinvent, we refined — 50 more lumens in the same rugged chassis, delivering better output without compromising balance or durability.
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Versatility in mounting: Comes with both helmet and handlebar mounts out of the box, so you don’t need to pick or compromise your mounting style.
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Modern charging & resilience: Upgraded to USB-C so charging is easier and more universal. Sealed and rated IPX6 for real-world spray and weather.
Testing & Real-Use Scenarios
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Night rides & trail work: We’ve mounted this light on helmets during late-night runs, mapping terrain, spotting ice, and navigating unlit stretches. The X850’s balance lets you forget it’s there until you need it.
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Cold & wet exposure: Exposed to snow, rain, and freezing spray — seals held, brightness remained stable, and the USB-C charging stayed reliable in damp, dirty conditions.
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Crash & vibration tolerance: Through off-trail bounces, minor tumbles, and trail chatter, we confirmed the housing and mounts keep the light locked in and functioning.
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Battery consistency: Multiple full-discharge cycles in cold temperatures — wattage drop and warm-up behavior were monitored to ensure usable output under real alpine conditions.
When You’ll Get Full Value Out of It
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Helmet-first riders: If your go-to mounting is your helmet, this light’s weight, beam pattern, and mounting logic make it an ideal fit.
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Utility over range: When you need brighter fill than a headlamp but don’t need a 2,000-lumen throw, this is the sweet spot.
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Multi-mount flexibility: You want one light for both vehicle and helmet use without buying extras.
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Day-to-night usage: Because of its efficient lower modes, you can use it during twilight, transition zones, or around camp without burning battery in full mode.
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Gear minimalists: When weight and simplicity matter, this is a high-output tool that doesn’t complicate your kit.
Kit Includes:
- USB-C Charging Cable
- GoPro Helmet Mount
- GoPro Accessory Mount
- Handlebar Mount
Details:
- Maximum brightness 850 lumens
- 3350 mAh battery capacity
- >200 m beam distance
- 85˚ floodlight angle
- IPX6 waterproof
- USB-C charging
- Dimensions 101 x 34 x 28 mm
- Weight 130 g weight
| Mode | Lumens | Runtime |
| High | 850 | 2 hr |
| Medium | 400 | 3 hr 5 min |
| Low | 200 | 6 hr |
| Eco | 100-50 | 23 hr 30 min |
| Strobe | 850 | 6 hr |
Not sure which Flashlight Kit is right for you? Check out this comparison chart.
Mountain Lab ships domestically from the United States. All orders over $50 qualify for free shipping.