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Black Diamond
Cosmo 350-R Headlamp

4.733333333333333 out of 5 stars
15 Reviews



Why We Like The Cosmo 350-R Headlamp

Stargazing is best done without a light, but we always need a bit of brightness to help us get to the tent. Black Diamond's Cosmo 350-R Headlamp comes in handy every camping trip every night, and it's even helpful for housework in all the nooks and crannies.


  • Black Diamond's headlamp for camping, hiking, and all-purpose outdoor activities
  • 350 lumen max output adjusts to dimming, strobe, and red settings
  • Rechargeable battery with micro USB charge port
  • Housing is waterproof tested to work under 1 meter of water for 30 minutes
  • Adjustable headband is made of Repreve recycled materials
  • Item #BLDZ9IE
Power Source
rechargeable, 1500mAh li-ion
Batteries Included
dimming, strobe, red LED, lock
[high] 210ft [medium] 147ft [low] 32ft
recycled elastic
IP67 (1m for 30min)
charging cord
Claimed Weight
Manufacturer Warranty
3 years
camping, climbing, hiking, backcountry touring

Overall Rating

4.5 based on 15 ratings

Review Summary

1 Stars - 0 reviews
2 Stars - 0 reviews
3 Stars - 1 reviews
4 Stars - 2 reviews
5 Stars - 12 reviews

What do you think about this product?


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5 out of 5 stars

July 20, 2024

Nice smooth beam

I really like the smooth beam from this headlamp and appreciate the rechargeable batteries as well. The 350 lumen rating is plenty of light for most conditions.

Mark J.

Originally reviewed on

5 out of 5 stars

July 10, 2024

Best headlamp I’ve owned

So easy to use, rechargeable, very bright if needed but dims quickly. Used this to do field work with bats and was bright enough to check nets and can be quickly dimmed or put in red mode to minimize disturbances. Highly recommend

Courtney C.

Originally reviewed on

5 out of 5 stars

February 9, 2024

Great headlamp

I have 4 black diamond headlamps. I bike ride with one. It stays with my bike for my work commute. I have one on my search and rescue helmet. I use it for hiking into the field. I also use it for repelling over the side of cliffs on car wrecks. I have one in my truck for all purpose use. And i have a backup that my daughter is currently using on dog walks. Love the red light. And love how adjustable the brightness is. All my lights are still working great. Oldest one is close to 10 years old and going strong.

Collin L.

Originally reviewed on

3 out of 5 stars

January 30, 2024

So much to like

So much to like: great 1500 mAh battery and good light output, but stupid micro-USB charging port. Please change to USB-C and improve the drop rating to 2 meters. And as long as I’m dreaming, please improve the weather rating.


Originally reviewed on

4 out of 5 stars

September 15, 2023

Great headlamp

This is perfect for backpacking due to it's weight and how long the battery lasts, but Black Diamond needs to get with the times and put a USB-C charging port on it. Every other small electronic I have can recharge on that cable, and when I'm counting grams I end up bringing my NiteCore headlamp because it is similar without needing another power cord.


Originally reviewed on

5 out of 5 stars

July 5, 2023

Perfect Headlamp!

After years of service my previous headlamp finally called it quits, it was a bruiser, but checking and changing batteries is not ideal. I am so happy to have a rechargeable headlamp and ready put this thing to good use!

Timothy C.

Originally reviewed on

5 out of 5 stars

June 14, 2023

Sleek and light

The headlamp is very easy to use and works great. It's very light as if you aren't wearing anything. I can see great when I run thanks to this headlamp.

Marni S.

Originally reviewed on

5 out of 5 stars

May 1, 2023

Starlight, Starbright

Who needs stars when you have this headlamp! It is light, snug, and perfect for nearly every outing. I love the different color options as well. Would 10/10 recommend.

Luke D.

Originally reviewed on

5 out of 5 stars

December 28, 2022

Cosmo 350-R

I gave them to my sons for Christmas presents. They both very excited and said this was just what they needed but we’re forgot to ask. Thanks

Gordon T.

Originally reviewed on

5 out of 5 stars

September 12, 2022

Awesome headlamp!!

Super light weight! Has a cool dimming feature when you hold down the button. Did a lot of research on different headlamps and went with this… glad I did. Would recommend to anyone looking for a headlamp.

Jared K.

Originally reviewed on