First Look: NEBO CurvBeam 850 Flex Headlamp

I’m a headlamp connoisseur. I ditched Energizer Bunny brands years ago and have amassed a shoebox full of others.

Why so many?

I use headlamps almost every single day of my life. A roaming western hunter who sleeps where his day on the mountain ends, my headlamp is a critical piece of my hunt gear. In October, when I shift my attention to whitetail, I tend to live under the glow of red/green lights. The same goes for gobbler-getter season. Plus, as an ultra-runner who spends his summer running through the night on gnarly trails, it seems the nylon band of a headlamp is always wrapped around my head.

Here’s a fact: Not all headlamps are created equal. For grins, I added up how many headlamps I currently have. It’s a bit embarrassing, but the total is 54. From Coast to Fenix to PEAX and Black Diamond, it’s an impressive collection.  As a gear tester, and as noted, someone who relies heavily on headlamps, only four of the 54 have made the cut. I have no room for clunky headlamps with subpar beams. I despise those with non-adjustable bands and poor battery life, and buttons that stick. Those with a non-adjustable head are worthless, and if a rechargeable battery isn’t included, the headlamp isn’t worth its salt.

NEBO CurvBeam 850 Flex

I’d heard good things about NEBO and was excited to put the CurvBeam 850 Flex Headlamp to the test.  NEBO CurvBeam 850 Flex First Impressions: I love the slim, light build. The minature, adjustable head jumped out at me, as did a pair of light bands on each side of the main head. I assumed those yellow bands were lights. However, I never look up reviews or even visit a product’s webpage before I examine it. I don’t want to form an opinion before looking a product over for myself.

The NEVO CurvBeam 850 Flex comes with a rechargeable battery (C-charger), and accessing and removing it from the back compartment is easy. I like the protected rubber cord that runs from the battery compartment to the right-side yellow/clear light section. The head pivots, and though the on/off button on top of the orange head is small, it’s easy to find.

The replacement battery charges quickly, and with the CurvBeam juiced up, I was instantly impressed by its numerous brightness settings and the amount of light the headlamp produces. Pressing the top button truns on a pair of lights, and the on/off button lets the user toggle through brightness settings.

The side lights also have a switch. Press the black, circular right-side button once, and the CurvBeam instantly covers a 180-degree area. You can run the CurvBeam in concert with the two lights inside the headlamp housing for added light. Press and hold the right-side black button, and you get instant red light, which is a must for any hunter.  Another feature I like is the battery box battery indicator button. Press the orange button to see current battery life.

The nylon band is fully adjustable and generally comfortable. I did a 6-mile night run with the CurvBeam 850 Flex and it rode well. As far as its ability to light the way, it’s a pack-leader in the headlamp arena. I would prefer a top strap in combination with the side strap, but after glancing at NEBO’s website, I see the manufacturer makes plenty of headlamps with a top strap.  Battery life was impressive.

The unit runs on AAA batteries or the included rechargeable battery. I got 7 hours of runtime with various lighting settings using the rechargeable battery, and 5:38 minutes with three DuraCell AAA batteries.

CurvBeam 850 Flex General Information

For anyone who demands versatile, hands-free lighting, the NEBO CurvBeam 850 Flex is an excellent option. With a 850 lumens, this headlamp is perfect for everything from challenging outdoor adventures to emergency situations. Its multiple lighting options adapt to any environment, with a wide 180º area light, an adjustable spotlight, and a crucial red illumination for preserving night vision.

The standout feature is the CurvBeam flexible COB technology, which delivers smooth, evenly distributed light across a broad field of view—ideal for close-range tasks and for enhancing peripheral visibility. The adjustable LED spotlight tilts to 90º, allowing you to focus the light exactly where it’s needed, while combined modes deliver maximum output for moments when full illumination is non-negotiable. Plus, the SafeSight signal light adds another layer of visibility, making it a ideal for low-light or roadside situations.

Comfort is not an afterthought here. The BackBalance Fi design positions the battery at the rear. This ensures an even weight distribution that reduces bounce and fatigue during extended use. The adjustable, soft-lined headband guarantees a secure and comfortable fit over hats, helmets, or just your bare head.

Powered by a USB-C rechargeable lithium-ion battery, the CurvBeam delivers up to 5 hours of runtime and fully recharges in about 2 hours. It’s built to withstand the rigors of demanding environments with IPX4 water resistance and impact resistance to ensure reliable performance in rain, cold, and the occasional drop. With seven different lighting modes and smart power management, this headlamp stands ready for whatever job or adventure comes your way.

Light wider, farther, and smarter with this versatile rechargeable headlamp. Whether you need bright 850-lumen output for wide-area visibility or focused spot lighting, the CurvBeam is designed for all-day comfort with its balanced weight distribution and multiple light modes. Tough weather resistance, USB-C recharging, and hands-free functionality make it a seasoned player in the headlamp arena.

NEBO CurvBeam 850 Flex Headlamp Specifications

• Bright 850‑lumen output with wide area and focused spot lighting
• CurvBeam® flexible 180º COB area light technology
• BackBalance Fit™ – comfortable band and balanced weight reduces bounce and fatigue
• Flex-Power™ – USB‑C rechargeable or AAA compatible with up to 5 hours of runtime
• SafeSight™ signal and red area light for visibility and night vision
• Built for tough conditions – IPX4 water‑ and impact‑resistant

Final Thoughts

As I continue testing the NEBO CurvBeam 850 Flex Headlamp, it has a spot in my top five all-time favorites. The combination of impressive brightness, versatile lighting modes, and comfortable design makes it a standout choice for my outdoor adventures. I appreciate its robust build and thoughtful features that cater to the demands of hunting, running, and emergency situations. I can’t wait to put it to the test during my upcoming hunting season. Certainly, with its performance thus far, I have high hopes that the headlamp will prove invaluable on the mountain under the stars.