The NU20 is one of Nitecore's newer headlamps and comes in two LED variants, one normal CREE and one high CRI Nichia. These have black bodies as default, though the CREE XP-G2 S3 LED is able to be placed in different colored finishes. With a li-ion battery inside, the NU20 can run for years. As long as you do, even.

The NU20 is machined out of durable polycarbonate, with the back it rests and tilts on able to swivel up and down. It is hard-anodized with six colored finishes, all having the same type of comfortable headband though the color of it depends on the NU20 it comes with. This headlamp is also rated to IPX7 standard, meaning it can go underwater to 1 meter for half an hour but any deeper or longer risks damage.

Features:

• Manufacturer's page: Nitecore NU20 (CRI)
• Compact and lightweight headlamp designed for runners
• Advanced power regulation provides virtually limitless lighting
• Max output to 360 lumens and max runtime to 100 hours
• NU20 LED: CREE XP-G2 S3
  NU20 CRI LED: Nichia 219B, CRI ≥ 90
• Built-in 600mAh high performance Li-ion battery lasts at least 500 recharge cycles
• Micro-textured reflector provides 100° wide angle illumination
• 52° illumination angle adjustment
• Switch guard to prevent accidental activation
• Hollow-carved head supports compactness while reducing weight
• Housing is made of durable polycarbonate materials
• Impact resistant to 1.5 meters
• Waterproof according to IPX7

Specifications:

• Output modes: Normal (CRI)
  Turbo: 360 (270) lumens/30min*
  High: 220 (170) lumens/6hr
  Mid: 40 (30) lumens/7hr 45min
  Low: 1 lumen/100hr
• Max beam distance: 80m (69m)
• Max beam intensity: 1600cd (1200cd)
• Length: 55.5mm/2.19in.
• Weight: 47g/1.66oz

* = Runtime on Turbo based on calculations, not actual tests