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UltrAspire LUMEN 850 Duo Waist Light

The Lumen 850 Duo offers versatility, high lumen output, and a wide feature set ready for any adventure. This light features UltrAspire 3D Lighting which casts shadows across uneven surfaces giving you a better understanding of your terrain. The Lumen 850 Duo comes with a headlamp strap allowing the light to clip in and double as a headlamp. Equipped with 3 regular modes, high, medium, low and a red light mode allows complete control over your lumen output. The large power button makes toggling through the setting intuitive and also includes a battery indicator light that when toggled on quickly illuminates green, gold, or red indicating battery level. It can be adjusted up or down in the bracket to your preferred lighting angle. The belt is built with an ErgoFit Waist design that sits comfortably on the body. Open cell foam placed behind the light bracket makes this light comfortable and helps to wick and dissipate moisture. This waist light includes one of our UltrAspire rechargeable 18650 batteries and features a USB Type-C charging port for a very quick charge. Includes a USB Type-C charging cable.


  • Aircraft grade aluminum
  • Included headlamp bracket
  • Conical belt
  • Adjustable angle
  • Easy to use performance buckle
  • Large buttons
  • USB Type-C charging port (charging cable included)
  • Breathable mesh
  • Low, medium, high, and blinking modes
  • Sturdy low-profile aluminum bracket included
  • Illuminated battery light indicator
  • 4-8 hour burn time
  • IPX7 Waterproof rating


  • Weight: 3.8oz (107g)
  • Size: 26″-38″, adjustable
  • Technologies: 
    • Low Weight™: Lightweight components and materials create an almost unnoticeable on-the-body feel without compromising durability
    • Steady Beam™: Prevents eye fatigue by maintaining a steady lumen output that does not dim until the battery is very low
    • Race Fit™: Conical shape, fatigue free buckles, and limited stretch elastic ensure a snug and stable fit
    • Stable Ride™: Proportional weight distribution and conical belt shape create a balanced load and no-bounce ride
    • Fatigue Free™: Easy operation for fatigued minds in extreme circumstances
    • AutoCool™: Heat dispersing fins mounted in and around the light passively dissipate heat
    • Widebeam™: Like daylight. Even lighting eliminates headaches and tunnel vision
    • Enduralight™: Sturdy construction and aircraft grade aluminum provide better durability and improved hot and cold tolerance while reducing overall weight
    • PerfectAngle™: Easily adjust up, straight, or down to suit your terrain