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Small, simple, and packing the light power you need.

Stash the Black Diamond Cosmo Headlamp in your backpacking bag or slide it into your pocket and always be prepared for the darkness. A DoublePower LED lights up the night for long-range viewing and two SinglePower LEDs maximize battery power while providing proximity lighting for reading or cooking at basecamp. Compact, lightweight, and easy to operate, this little lamp is an ideal light source if you're counting ounces or need a reliable backup headlamp.

  • LED bulbs are efficient with battery power and powerful enough to provide the light you need
  • One DoublePower LED throws light up 33 meters and burns for 50 hours on the highest setting
  • Two SinglePower LED bulbs throw light up to 18 meters and burn for 90 hours on the highest setting
  • Three AAA batteries are stored up front in the high-impact plastic light housing
  • Elastic headband is adjustable to fit a variety of head shapes and sizes
  • IPX-4 standard water resistance allows this headlamp to withstand light precipitation

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Black Diamond Cosmo Headlamp

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Here's what others have to say...

5 5

Love this little guy!

  • Familiarity: I've put it through the wringer

Great headlamp. Excellent battery life, solid construction, and awesome band colors. The operation/selection between modes can get tricky at first, but is easily figured out. Fantastic value, too.

5 5

This headlamp makes me feel badass

  • Familiarity: I've used it several times

I'm not a hardcore adventurer or climber but I like to hike and got the Cosmo headlamp for some night hikes and camping for a recent trip to some national parks in CA. Aside from how obviously practical it is - you'll never think about using a flashlight again - it's easy to use, comfortable, and effective. The red light for "night vision" is especially neat. The range of light intensity is great. The angle is adjustable. I have only praise. Great for hiking or around camp or in the tent, trips to the bathroom, you name it. Great to have hands free - came in handy when we got stuck in some sand at night and had to try to dig ourselves out to get back on the road. Drop $30 and buy it.

5 5

Excellent lamp for cost!

  • Familiarity: I've put it through the wringer

I've had this lamp for several years but it has been reliable and true. Anyone who knows alkaline batteries will know they drain with time and therefore always go out with new batteries. If you know your lamp then you don't need a battery indicator, only on recharchable lamps. Be wise and carry or replace batteries as indicated but this lamp rocks for the money! The dimming options and red light capability is awesome and beyond what's expected beyond the cost. I'll be packing this lamp for many more expeditions.

Unanswered Question

Does anyone know if this headlamp fits a...

Posted on

Does anyone know if this headlamp fits a Petzl Vertex vent helmet? Tight fit? Too Tight? Too Loose? That kind of info would be helpful. Thanks.

3 5

Not worth saving money over BD Spot

  • Familiarity: I've put it through the wringer

I have used this and my Black Diamond Spot interchangeably for the past 2-3 years. Even cycling I don't notice that this lamp is not as bright as the Spot. But, after storing them both I do find the batteries almost completely drained on both lamps... but I wouldn't know that with this lamp until it dies in the middle of a night hike because it lacks a battery indicator. I'd go with the Spot just for that feature.

5 5

Great little torch

  • Familiarity: I've used it several times

Nice lamp. Modes are great and the batteries last forever. I like the red mode for when I'm out stargazing . Great little lamp for the weekend camper on the way to the bathroom .

4 5

Perfect for the Price

  • Familiarity: I've used it several times

This is an awesome beginner headlamp. For general camping and hiking trips, this is all you will need. With a range of over 30 meters, you wont ever be worried about falling off that cliff. And the different modes (strobe, high and low beams, red light) are awesome for many different needs. The only problem I have is that I feel like 3 batteries is a little much for a such a small light. But in retrospect, I haven't had to replace them yet, so that is awesome after many, many uses.

5 5

Consider more than one!

  • Familiarity: I've put it through the wringer

No frills, just light. If you haven't ever had a head lamp, this is a great one to start with- nothing special, just a light. the batteries seem to last forever, it illuminates everything in front of you. Great for night time anything, day time searches in the depth of your backpack, or working under a car. the only bad thing about it is having to remember where you put it! (i suggest buying several)

5 5

This headlamp is the bomb

  • Familiarity: I've used it several times

This headlamp is the bomb. I had an old single mode LED headlamp that I used for years and I thought was pretty nice, but until I upgraded to this one I had no idea what I was missing. I like that you can dim the high and low beams to find the exact amount of light that you want. The red light feature is also fantastic for when you want just a little bit of light without killing your night vision. The Cosmo is great for hiking, camping, climbing, and even bike rides at night. Plus at $30, how can you not go wrong? This is by far the best value on the market. I will definitely be buying this again.

5 5

Best headlamp for under $30

I lost my old headlamp and that lead me to do some research for a new one. My goal was to keep it under $30 (because it's an item I could lose easily I didn't want to spend too much money). I determined this was the best headlamp for the price for the following reasons:

Lumens: For a $30 headlamp you won't find one with more than 70 lumens. A 30+ meter beam of light is enough to keep your nerves down if you find yourself in a dark, spooky place.

Features: While there are a couple of other $30 headlamps with 70 lumens, they don't have the superior features of the Cosmo. It has a high beam, which is focused, and also a low beam, with is diffused. Both can be dimmed to the desired brightness. It has a strobe for dance dance parties in the backcountry and a red light to ensure your tent mates don't wake while you study your trail maps.

Full disclosure: I didn't keep this headlamp. I splurged an extra $10 and went with the brighter Black Diamond Spot. For the price, this headlamp can't be beat.

5 5

Well done.

It's bright, it's comfy, it's all I need. I feel lost camping without my headlamp.

5 5


I've owned my fair share small headlamps and this one is the best. Ordered it as a gift for someone in my house...will definitely be ordering one for me. This thing is super bright. Way brighter than some of the slightly cheaper BD lamps. Uses three batteries as opposed to two but still feels lightweight. Also looks pretty sweet, which doesn't hurt. The red light is a nice touch. If it comes down to spending ten bucks more and getting this lamp over a cheaper one...drop the scratch.

4 5

Great Gift

  • Familiarity: I gave it as a gift, but have feedback to share

I gave this headlight as a gift for Christmas. It was a huge hit. I like the fact that his headlight has a red light too which is great for keeping night vision. The shape is also very appealing.