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  • NU25-UL Headlamp
  • POWER & MODE Buttons
  • NU25-UL Headlamp
  • Nitecore NU25-UL Headlamp
  • Simple, Lightweight Design
  • Ultralight
  • 3 Sources
  • Dual Primary Lights
  • 400 lumens
  • Mix Mode - Spotlight + Floodlight
  • Red Light
  • Specifications
  • One-Hand Operation
  • Reflective
  • Built-in Li-ion Battery
  • USB-C Rechargeable
  • Power Indicators
  • Lockout Mode
  • Long Standby
  • Water & Impact Resistant
  • Features

Nitecore® NU25-UL USB-C Rechargeable Headlamp

    • 3 Sources – Spotlight, Floodlight, Red
    • Brightness up to 400 lumens, runtime up to 45 hours
    • 4 brightness levels + 2 rescue modes
    • Red light preserves night vision
    • Integrated Li-ion USB-C rechargeable battery
    • Plug into power bank to recharge
    • Lightweight  1.64 oz (46.5 g)


    Nitecore® NU25-UL is a USB-C rechargeable headlamp with three distinct sources – Spotlight, Floodlight, and Red. This innovative headlamp has four brightness levels up to 400 lumens in Mix mode, a runtime of up to 45 hours on Ultralow, a red light to preserve night vision, plus two rescue modes. The standard dual shock cord UL headband is comfortable and highly adjustable to fit your head, hat, or helmet. And recharge by simply plugging into a power bank. A true thru hiker fav.

    NU25 uses unibody TIR optics to provide 100˚ wide-angle flood illumination for outstanding night vision with one source plus more focused spot illumination for longer distance vision with the other. Or use Mix mode to combine spot and flood for a more fully illuminated field. For reading or close-up work, the light tilts down up to 50˚. There’s also a red light to help preserve night vision that won’t blind your friends. Use during star gazing, map reading, night photography, gear organizing, or doing camp chores. Use Slow Flash for a repeated short red flash to indicate caution.


    nitecore-nu25ul-sources.png   nitecore-nu25ul-power-mode.png   


    The headlamp has two buttons – POWER and MODE. Double press POWER to direct access Ultralow. Or long press POWER once for Low in Mix mode. Repeatedly press POWER to cycle from Low>Mid>High>Low. Short press MODE to switch modes. Repeatedly press MODE to cycle from Mix>Spotlight>Floodlight>Red>Mix. When Spotlight/Floodlight is on, repeatedly press POWER to switch from Low>Mid>Low. Long press either button to turn off.



    For direct access to Red, long press MODE for Low, then repeatedly press POWER to cycle from Low>Short Flash>Low. Long press either button to turn off.

    You can also access two rescue modes, SOS and Beacon. SOS repeatedly flashes SOS in Morse code (. . . ––– . . .), while Beacon repeatedly flashes a single short flash. Double press MODE to enter SOS mode. Repeatedly press POWER to cycle from SOS>Beacon>SOS. Double press MODE again to return to the previous state.

    Long press both buttons at the same time to lockout and prevent the light from turning on while in your pocket or pack. The headlamp flashes three times to indicate lockout. Long press both buttons again to reactivate the headlamp and enter Ultralow mode.



    NU25 has a built-in, long-lasting 650 mAh Li-ion rechargeable battery that’s much more sustainable than AAA batteries. An intelligent protective charging circuit and a USB-C connection make it quick and easy to recharge. There’s no need to worry about running out of power or replacing batteries, just plug into a power bank, wall charger, computer, or car (USB cable provided). The light maintains full functionality while charging.

    To see how much battery power is left, with the light turned off, short press MODE and blue power indicators will light up. One light equals 25% left, 2 lights 50%, 3 lights 75%, and 4 lights 100%. Plug it in and the four blue lights will flash. When charging is complete, the four blue lights will become steady on. It takes approximately 1 h 25 min to fully charge the battery. A rubber cover protects the USB-C port from dirt and moisture.



    LED Mode Output (lumens) Runtime (hours/min) Beam Distance ft (m) Beam Intensity (cd)
      Mix – Spotlight + Floodlight Low 60 10 h 25 min 79 (24) 150
    Mid 200 4 h 40 min 148 (45) 525
    High 400 2 h 40 min 210 (64) 1029
    SOS 400      
    Beacon 400      
      Spotlight Low 60 10 h 30 min 102 (31) 253
    Mid 200 4 h 15 min 190 (58) 862
      Floodlight Ultralow 6 45 h 13 (4) 4
    Low 60 10 h 39 (12) 39
    Mid 200 4 h 15 min 75 (23) 138
      Red Low 10 16 h 26 (8) 15
    Slow Flash 10      


    LED Color Temperature

         Spotlight: 5500K, Neutral White

         Floodlight: 5500K, Neutral White    

    Battery: Built-in rechargeable Li-ion, 650 mAh

    Lighting Modes

         Mix – Spotlight + Floodlight: Low/Mid/High/SOS/Beacon

         Spotlight: Low/Mid

         Floodlight: Ultralow/Low/Mid    

         Red: Low/Slow Flash

    Beam Pattern

         Floodlight: 100˚ wide-angle    

    Body: Polycarbonate, impact resistant

    Angle Adjustment: 5

    Switch: Top Power and Mode buttons, rubber

    Charging Connection: USB-C, side, rubber cover (USB-A to USB-C cable provided)

    Charging Time: 1 h 25 min fast charge

    Dimensions, Light with Bracket (LxWxH)

         NU25-UL Headlamp: 2.37 x 1.3 x 1 in. (60.1 x 33 x 25.5 mm)    

    USB Cable Length: 20 in. (0.5 m)


         NU25-UL Headlamp Total: 1.64 oz (46.5 g) measured, 1.59 oz (45 g) specified

         USB Cable: 0.5 oz (14.3 g)

    Impact Resistance: 3.3 ft (1 m)

    Ingress Protection Rating: IP66, complete dust protection and high-pressure water jet resistant


         1x Rechargeable headlamp with UL headband

         1x USB-A to USB-C charging cable, 20 in. (0.5 m) long     


    User Manual

    Nitecore NU25-UL User Manual



    • Very bright light, to avoid eye injuries, DO NOT stare directly into the light and DO NOT shine the light directly into the eyes of others.
    • Keep away from children to avoid injury.
    • DO NOT use if battery is damaged to avoid fire or explosion.
    • Charge in or on a fire-proof surface to avoid possible injury. DO NOT charge unattended.
    • Charge only at temperatures between 32-113°F (0-45°C) to avoid permanent damage and possible fire or explosion during charging.
    • Recycle or dispose of properly according to local regulations at end of life, DO NOT dispose in fire or incinerator as battery may catch fire and explode.

    In no event shall Litesmith, LLC be liable for any direct, indirect, punitive, incidental, or special consequential damages, to property or life, whatsoever arising out of or connected with the use or misuse of its products.

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