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Black Diamond
Cosmo 300 Headlamp

4.9375 out of 5 stars
16 Reviews

Out of Stock

Don't worry though, we have a lot more Headlamps in stock than that.

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Cosmo 300 Headlamp

No need to stumble through dark campsites, the Cosmo 300 has you covered with a compact headlamp that packs in 300 lumens to light the path back to the tent. It features a slim profile, and fully waterproof body that holds up to backpacking adventures.


  • A slim headlamp that lights the way through the woods
  • Small, light, and sleek waterproof body holds up to the elements
  • Red night vision provides light that won’t blind your buddies
  • Settings for close proximity or viewing out into the distance
  • Adjustable strap lets you cinch down the perfect fit for you
  • Digital lockout feature prevents accidental use when stored in a pocket or pack
  • Item #BLDZ9C9
Power Source
Batteries Included
proximity, distance, dimming, strobe, red night-vision, lock
[highest setting] 75m, [lowest setting] 8m
Burn Time
[highest setting] 4.25H, [lowest setting] 200H
Claimed Weight
Manufacturer Warranty
3 years

Overall Rating

5 based on 16 ratings

Review Summary

1 Stars - 0 reviews
2 Stars - 0 reviews
3 Stars - 0 reviews
4 Stars - 1 reviews
5 Stars - 15 reviews

What do you think about this product?


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5 out of 5 stars

July 17, 2022

A bit expensive for performance.

This went to SFAS and was solid, however you can find better performance for a bit cheaper with a LEDlenser.


Originally reviewed on

5 out of 5 stars

July 17, 2022

Great headlamp

This is a great head lamp. I was looking for something that was light and I could access the red pattern without going through white...this fits the bill. Good battery life (4 nights and early morning walk-ins). Only slight issue I have is discerning between the bottoms with gloves, after continued use I was better. Definitely recommend, and would order again.

Richard B

Originally reviewed on

5 out of 5 stars

July 17, 2022

Cosmo 300 is awesome

This powerful little tool is perfect. Compact size puts out bright light. Several light settings including red (good for firefly viewing). Tilt feature is great. Fits nicely in pocket. And comes with batteries.

Brian L

Originally reviewed on

5 out of 5 stars

July 17, 2022

Best headlamp I’ve owned. It’s worked through rain and cold and the battery life is good. The red light is also super useful. Strongly recommend this headlamp, especially at the price point.

Austin F

Originally reviewed on

5 out of 5 stars

July 17, 2022

I'm very happy that I chose to invest in the Cosmo line for my family

I purchased three of these for my family (me, my wife, and my 6 year old daughter) and we love them for hiking/camping! The reason I went with the Cosmo for a few reasons. First of all, they had a red light option to save our night vision. Second, I prefer a non-rechargeable system, that way I know I can just throw a few extra batteries in my pack and everyone should have light (I've yet to change the stock batteries after a dozen late night hikes/camps) Lastly, the price for this model is great! That made outfitting my whole family with these a much easier decision to make.

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Ian H

Originally reviewed on

4 out of 5 stars

November 27, 2020


Haven't had the chance to put it through a good workout yet, but it's bright, light, and easy to use. We'll see how the plastic housing stands the test of time. It's far superior to my old headlamp and the price was right.


Originally reviewed on

5 out of 5 stars

November 14, 2020

I can blind people far far away

I use this every night on our acreage. Very happy with it. Plenty bright.


Originally reviewed on

5 out of 5 stars

November 3, 2020

great product

got it two weeks ago and love it. Its easy to use and has a great reach for its size

ale mar

Originally reviewed on

5 out of 5 stars

November 2, 2020

This is my replacement. Love it.

My original BD Headlamp quit working. I used it on the Camino. This is my replacement. I use it on the farm. Love it.


Originally reviewed on

5 out of 5 stars

September 22, 2020

A staple in your outdoor kit

Black diamond has so many different headlamps it's hard to choose. I chose the cosmo 300 for its simplicity of just 1 button to function through all the lighting options, even while wearing gloves. And this lamp is very light, compact and very effective, used for hiking and hunting - very easy to cycle from a strong beam to a softer/wider angle. Overall, very user friendly and reliable headlamp.


Originally reviewed on