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Black Diamond
Cosmo 350 Headlamp

4.407407407407407 out of 5 stars
27 Reviews
Color:Creek Blue



Why We Like The Cosmo 350 Headlamp

The simplicity of the Cosmo 350 Headlamp makes it a go-to choice for runs, hikes, climbs, or nights when a storm cuts the power to our house. With multiple burn modes and night light options, we can choose the best option to light our way. We really like its Dual Fuel design which lets us run it on its rechargeable battery or from three AAAs.


  • Multi-use lantern for general recreation or around the house
  • Dual fuel flexibility for greater burn time if one source dies
  • PowerTap tech lets you switch modes with a tap of the finger
  • Integrated battery meter shows you how much juice you have left
  • Digital lockout button ensures it won't turn on in your pack
  • Has dimming, strobe, red night-vision, and lock mode settings
  • Item #BLDZ9ID
Power Source
Dual Fuel (rechargeable BD 1500 lithium or AAA batteries)
Batteries Included
low, max, reserve
[max] 60m
Burn Time
[low] 200hr, [max] 4hr 15m, [reserve] 24hr
(rating) IPX8
Manufacturer Warranty
3 years
hiking, running, climbing, weekend camping

Overall Rating

4.5 based on 27 ratings

Review Summary

1 Stars - 2 reviews
2 Stars - 2 reviews
3 Stars - 0 reviews
4 Stars - 2 reviews
5 Stars - 21 reviews

What do you think about this product?


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5 out of 5 stars

February 20, 2024

Awesome Cosmo 350 Head Lamp!

My old head lamp was beyond old and couldn't recharge anymore so I bought this head lamp as my last one was from Black Diamond. It's amazing! The area it lights is amazing! I love the idea of rechargeable batteries so I'll try to get them soon. Love this head lamp!

Margaret L.

Originally reviewed on

5 out of 5 stars

February 11, 2024

Simply Awesome!

The brightness is unreal! Weighs next to nothing, comfortable strap and red light for night vision is perfect. I did not get the rechargeable battery oack as yet but planning to at some point.

Ravi K.

Originally reviewed on

5 out of 5 stars

January 6, 2024

Perfect Package

Got the light and rechargeable battery. Like the ease of controlling the light on/off, intensity, mode, and color. The new open to the elements battery compartment makes opening the case much easier then previous models. Haven't tested battery life yet.

Mark B.

Originally reviewed on

2 out of 5 stars

November 3, 2023

miserable experience

I hate myself every time I try to use this under powered, over priced light. If you want to read a book befor bed, this would be a good light. If you need a dependable light that actually shines a great amount of light this is not it.

steve M.

Originally reviewed on

4 out of 5 stars

October 11, 2023

Great starter "real" headlamp

Getting into hiking and backpacking with my sons. Have Spot 400 models for myself and oldest son. Wanted to get a slightly more economical one for my younger son who tends to lose things hah. Still has most of features that make BD headlamps the best

Justin C.

Originally reviewed on

5 out of 5 stars

October 9, 2023

Dependable Headlamp

I put these in my backcountry skiing and rock climbing packs. Always work well when needed. Easy to use. Never had any issues.

John D.

Originally reviewed on

1 out of 5 stars

October 2, 2023

Failed when I needed it

I usually never take the time to write a review but in this case felt necessary. I had this lamp for about a month hadn't used it at all , I went on a backpacking trip sun had gone down needed the headlamp It never worked. I was surprised because it was brand new with new batteries. Glad a friend of mine had an extra on him. If not would have been very hard to get back to camp.


Originally reviewed on

5 out of 5 stars

September 18, 2023

Great Light

The brightness was surprising to me and I’m really liking the several different modes the light has. The construction seems to be durable and I don’t think I’ll have to worry about its durability. I have yet to test it in the long term, but the documented battery life is impressive. I’ll update if anything changes.

Jay P.

Originally reviewed on

5 out of 5 stars

September 17, 2023

Black Diamond flashlight headband.

I Black, Diamond, Equipment flashlight. I’m very happy with it has a red light like it was told to be like it’s beautiful thank you. Black diamond.

Gary L.

Originally reviewed on

5 out of 5 stars

July 28, 2023

Great for camping

The cosmo provides a ton of light for the size. Lightweight and packs easily! The red light function is great for preserving night vision when needed.

Nick K.

Originally reviewed on