
Nitecore NU21
Dimensions
- Length:
60.1 mm / 2.37"
- Width:
33 mm / 1.3"
- Depth:
25.5 mm / 1"
- Weight:
44 g / 1.55 oz.
Construction
- Material:
PC materials
- LED:
High performance LED
- Switch:
Dual switches on top of light
- Lens:
Unibody optical lens
Features
- Rechargeable:
Yes
- Special Modes:
Red light
- Maximum Output:
360 lumens
- Maximum Beam Distance:
58 meters
- Water Resistant:
IP66
Battery
- Included:
Built-in li-ion
- Compatible:
N/A

Nitecore NU21
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Description
The Nitecore NU21 is an ultra lightweight dual beam rechargeable outdoor headlamp with a maximum output of 360 lumens and weighing just 44 grams.
The advanced headlamp features a one-hand operational dual button interface, a user-friendly and tailor-made reflective, glow-in-the-dark headband, high performance LEDs and a red light, making it the perfect headtorch for trail running and other outdoor activities.
The NU21 is rechargeable using the USB-C charging port on the side of the torch. A power indicator is available with a short press of the mode button to show how much charge is left. A lockout mode is also available for accidental activation prevention, making it safe to carry or store the headlamp in a backpack or pocket.
The Nitecore NU21 also features:
- Built-in 500mAh battery
- Highly efficient constant current circuit
- 4 Brightness levels
- 3 special modes
- IP66 waterproof/dustproof rating
- impact resistant to 1 meter
Brightness levels, beam distance and runtime
Dual Light
High: 360 lumens - 58 meters 2 hours
Mid: 170 lumens - 38 meters - 3.5 hours
Low: 60 lumens 24 meters - 8 hours
Ultralow: 6 lumens - 6 meters-37 hours
SOS: 360 lumens
Beacon: 360 lumens
Red Light
Constant on: 5 lumens - 4.5 meters - 26 hours
Slow flashing: 10 lumens
Includes: headband, USB-C charging cable
Advanced Temperature Regulation (ATR) adjusts the output of the NU21 based on the working and ambient temperatures. This feature ensures that the device maintains optimal performance while preventing the LED from overheating. The output measurements account for the total runtime, including periods of reduced brightness due to temperature changes or built-in protection mechanisms, which may cause the brightness level to drop.
Available in Black, Yellow or White.
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