Black Diamond Cosmo Headlamp

Priced: $22.46 - $39.99 Rated:   - 5 stars out of 5 by 70 reviews.
Black Diamond Cosmo Headlamp -
Black Diamond Cosmo Headlamp Features.

Black Diamond Cosmo Headlamp.
Enjoy your adventures more with this Black Diamond Cosmo Headlamp. This headlamp from Black Diamond is a very useful item that you can take with you when you go climbing, hiking, rappelling, or on any other adventure, thanks to its brilliant light. It comes equipped with 1 DoublePower LED, 1 SinglePower red LED, and 2 SinglePower white LEDs in order to output a whopping 70 lumens that light up all your surroundings. It has various settings, including modes for when you want to focus on your immediate area and for distance, among others. It works with 3 AAA batteries which are included in the pack. Plus, this headlamp has an IPX rating of 4 so that it is fully protected against splashing or sprays of water. Have the best of times in the great outdoors with this Black Diamond Cosmo Headlamp.
This product can only be shipped to U.S. addresses.

Key Features.


  • IPX4 water-resistant construction ensures the Black Diamond Cosmo headlamp will work in inclement weather


  • Elastic headband is adjustable to fit a variety of head shapes and sizes
  • Compact design fits securely around the head with an adjustable elastic band that won't pull hair


  • Adjustable tilt-housing pivots up and down
  • 1 central DoublePower LED throws a 70 lumen beam a maximum distance of 40m; 2 proximity LEDs throw a 16 lumen beam up to 25m or down to 6m for activities around camp
  • Set the brightness of the light to meet your needs with the dimming switch—simply hold down the on/off button to activate dimmer


  • Adjustable strap


  • 3.2 oz (w/ batteries)
  • Tiltable head
  • 130m max distance
  • 3 AAA batteries (included) provide up to 250 hrs. of use on low and 43 hrs. on high; battery compartment is just behind LEDs for a compact design
  • Use the on/off button to navigate from the bright DoublePower LED, to the 2 proximity LEDs and then to the strobe function
  • Light output increased from 55 lumens to 70 lumens (on max setting)
  • 3-year manufacture warranty
  • Strobe mode for night running or cycling, or for emergencies
  • One DoublePower LED coupled with 2 SinglePower LEDs emit 70 lumens (max setting)
  • Positron switch activates 8 different settings and 2 modes
  • 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
  • Red night vision mode activates without cycling through white mode
  • Settings include full strength in proximity and distances modes, dimming, strobe and red night vision
  • 3 Level power meter displays remaining battery power
  • IPX-4 standard water resistance allows this headlamp to withstand light precipitation
  • 1 DoublePower LED coupled with 2 SinglePower LEDs ensures that you always have the right amount of light
  • Rubberized toggle switch
  • LED bulbs are efficient with battery power and powerful enough to provide the light you need
  • SinglePower or DoublePower LED emits a long distance, focused beam for high speed activities or route finding
  • Low beam proximity cast broad lighting for reading, camp duties or to conserve battery power
  • High quality lenses keep light pure and artifact-free
  • Streamline design sets the beam at an efficient illumination angle; ratcheting swivel head aims light where you need it
  • 250 hours max battery life
  • Switch to the single red LED to look at maps or read a guidebook without ruining your night vision
  • Red mode memory turns headlamp on in the same setting as it was turned off
  • 1 SinglePower red LED helps preserve night vision
  • Single switch activates all modes plus dimming
  • High-quality lens tunes the light output and shape of the beam to make the Cosmo ideal for general outdoor use
  • Protected against splashing or sprayed water from any angle (IPX4)
  • Max Burn Time on Highest Setting: 1 Doublepower 43 H/ 2 Singlepower 90 H
Black Diamond Cosmo Headlamp - Lightweight, powerful and affordable, the Cosmo headlamp from Black Diamond delivers performance for backpacking and camping. The Cosmo's durable rubberized switch activates multiple brightness modes for the right combination of vision and battery life. Red vision mode activates without cycling through white modes. The sleek low-profile design and adjustable strap provide the perfect fit. Multiple brightness settings and a strobe feature make the Black Diamond Cosmo headlamp a versatile backcountry companion.
Improved and updated, the Black Diamond Cosmo headlamp now boasts a brighter beam and greater lighting versatility.
Two side LEDs and one central 0.5-watt LED throw light a maximum distance of 32 meters, bettering the 21 meters of the original Cosmo.
Streamlined design sets the beam at an efficient illumination angle; ratcheting swivel head aims light where you need it.
Two bright LEDs and single 0.5-watt LED operate independently; switch on top lets you select from low, medium or high lighting levels for each.
Strobe functions for the paired LEDs and the 0.5-watt LED create signaling capabilities.
Water-resistant construction gives full-on reliability in inclement weather.
Headlamp features an automatic turn-off function should it accidentally be left on in a pack; lamp turns off at 9.5 hours.
Compact design fits securely around head with adjustable elastic band that won't pull hair.
Runs on three AAA batteries (included); battery compartment is just behind LEDs for a compact design.
The Black Diamond Cosmo is a great headlamp with all the features you need for backpacking and camping in different settings.

Appalachain Outdoors
Whether you are rappelling off of your multi pitch climb at dusk, trying try to finish a 15 mile stretch into camp or locating the bathroom in the middle of the night the Cosmo headlamp from Black Diamond Equipment will be there to light up the way. With a sleek low profile design the Cosmo can go anywhere at anytime. Black Diamond built in LED lighting offering 70 lumens of high power light that can reach 40 meters away. For your next adventure make sure to take the Cosmo from Black Diamond Equipment to brighten your nights.
Rocky Mountain Trail

With a stunning design and 70-lumens of output, the fully featured Cosmo headlamp is ultra versatile.
Featuring a sleek design and ample feature set, the 70-lumen Black Diamond Cosmo headlamp is equally at home cooking dinner at the campsite or rappelling off a multi-pitch route after the sun goes down. Standard distance and proximity modes, both dimmable, are complemented by a red night vision mode-extra handy when waking in the middle of the night-and all modes are accessible via one simple-to-use button. And with a housing built to withstand sprayed water from any angle, the Cosmo is ready to brave nearly any storm you may encounter on your adventure.

Black Diamond's new, more powerful Cosmo Headlamp offers advanced technology in a sleek, full featured package. More lumens and more features have been added for an even better value. Settings include full strength in proximity and distance modes, dimming, strobe and red night vision to create light beams custom to your needs. By using a combination of these LED types, Black Diamond offers a solution for every outdoor activity from climbing to hiking to car camping. This sleek, low profile version uses 3 AAA batteries(included).


The Black Diamond Cosmo Headlamp is simple and sleek and ready to tackle any adventure when the sun goes down. This 70-lumen headlamp is happy to assist at the campsite kitchen or rappeling off a multi-pitch climb that took a little longer than you thought. Offering standard distance and proximity modes, both dimmable, complemented by a red night vision mode-extra handy when waking in the middle of the night. All modes are accessible via one simple-to-use button. The housing is built to withstand sprayed water from any angle, making the Cosmo ready to brave nearly any storm you may encounter on your adventure.

FEATURES of the Black Diamond Cosmo Headlamp.
SPECIFICATIONS of the Black Diamond Cosmo Headlamp.

The super-versatile Black Diamond Cosmo Headlamp delivers the brilliance needed to light up base camp and beyond. Its single switch activates three modes for short- and long-distance illumination. At maximum, two single-power LEDs and one double-power LED emit a powerful 70-lumen beam. On double power, beam reaches out to 33 meters and runs for up to 175 hours. On single power, beam illuminates out to 18 meters and runs up to 150 hours. Its Dim control lets you adjust to your lighting need. Compact design seals out water from any angle. Runs on three AAA batteries (included).  
Weight with batteries: 3.17 oz.
Available: Dark Shadow, Black, White(not shown), Plum.

Offered in several easy-to-find shades, the Cosmo Headlamp from Black Diamond is a versatile headlamp with the size and weight of a backup light and enough power for basecamp and beyond. Two SinglePower LEDs and a strong DoublePower LED cover short- and long-range viewing with an impressive 70 lumens on max setting.

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.

The Black Diamond Cosmo headlamps is a lightweight, versatile headlamp, capable of taking the lead position on the trail or providing a backup headlamp in your pack.


With a maximum light output of 70 lumens, the Black Diamond Cosmo headlamp delivers a high-quality beam that is well-suited for night hikes, route finding and use around the campsite.


Mountain Gear
Light up your path at night with the Cosmo Headlamp from Black Diamond.

Eastern Mountain Sports (EMS) (2013)
In keeping with its motto of "the most lumens for your dollar," Black Diamond has redesigned its versatile Cosmo headlamp to increase brightness without increasing size, weight, or price.
A compact lamp optimized for bright, close-range lighting plus a DoublePower LED for distance viewing.

Half-Moon Outfitters
LED Type: 1 DoublePower, 2 SinglePower
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Review RatingNumber of Reviews
3 Lighting Modes:Single Power, Double Power, and Red Light
Additional Info:IPX Rating : 4
Available Color(s):Bright Teal, Dark Shadow, Matte Black, Plum, Process Blue
Average run time:High: 43 / low: 250 hours
Batteries:3 AAA (included)
Battery:3 AAA included
Battery Life:up to 250 Hours
Battery Type:3 x AAA (included)
Battery life at 70 degrees:High
Beam distance:High: 40 / low: 6 meters
Beam type:Flood / Spot
Brightness (lux @ 2 meters):High
Brightness Modes:Variable
Brightness levels:2 + dimmer
Bulb:70 Lumens; 1 DoublePower LED, 2 SinglePower White LED and 1 SinglePower Red LED
Bulb detail:High-output LED/2 LEDs/red LED
Bulb type:2 LEDs / 1 0.5-watt LED / Red LED
Bulbs:One DoublePower LED coupled with 2 SinglePower LEDs
Burn Time:175 H (DoublePower); 250 H (SinglePower)
Burntime on High:43 hours
Burntime on Low:250 hours
Dimensions:2.27 x 1.69 x 1.4 inches
Distance:33 m (DoublePower); 18 m (SinglePower)
Distance on High:131.2 ft / 40 m
Distance on Low:82 ft / 25 m
Features:Red Light Mode
Housing Tilts:Yes
IPX Rating:4
IPX Ratings:4
Item Weight:3.2 oz w/ batteries
LED Type:1 DoublePower, 2 SinglePower
Light LED Type:1 DoublePower, 2 SinglePower
Light Lumens:70
Light Max Burn Time:150 H (DoublePower), 250 H (SinglePower)
Light Max Distance:40 m (DoublePower), 25 m (SinglePower)
Light output:High: 70 / low: 4 lumens
Lighting Use:Sport/Outdoor
Lumen Range:50-99 Lumens
Max Beam Distance:Double Power (highest setting): 40 m
Max Burn Time:175 H (SinglePower LED), 200 H (2 SinglePower LEDs)
Max Distance on Highest Setting:1 Doublepower 40 m/ 2 Singlepower 25 m
Max Distance on Lowest Setting:1 Doublepower 6 m/ 2 Singlepower 8 m
Max Distances:38 m (SinglePower LED), 14 m (2 SinglePower LEDs)
Max Lumen Output:70 Lumens
Max Lumens:1 Doublepower 70 / 2 Singlepower 16
Max beam distance (m):40 meters
Max light output (lumens):70 lumens
Maximum Battery Life:250 hr.
Maximum Burn Time:250 hours
Maximum Range:40 m
Maximum beam distance:High
Minimum Lumen Output:16 Lumens
Modes:Settings include full strength, dimming and strobe
Output:55 lumens
Power Type:Battery
Recommended Use:General Backpacking or Camping
Red light mode:Yes
Regulated output:No
Strobe Mode:Yes
Warranty:3 Years
Water Resistant:Yes
Waterproof:Water-Resistant (IPX 4)
Weight:Weight With Batteries : 90 g (3.2 oz)
Weight (with batteries):90 g / 3.9 oz
Weight W/ Batteries:90 g (3.2 oz.)
Weight Without Batteries:44 g, 1.6 oz
Weight with batteries:3.2 ounces (90 g)
Compare specifications to related products.

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Subcategories of Lights & Headlamps:

Black Diamond Cosmo Headlamp Reviews:

Positive Reviews:

Great little headlamp for the dollars

My old Petzl Tikka headlamp, being eleven years old, was wearing out. The headband was stretched out of shape and the body had a crack in it, so it was time to replace.

I shopped for a new headlamp, and narrowed down to a few models, including the Cosmo. Finding it on sale, I went for it.

The headlamp has three LED's... two normal brilliance, and one super-bright bulb in the center. The two bulb configuration (16 lumens) is fine for working around camp, preparing meals, getting the tent set up, etc. The center bulb at a whopping 70 lumens is great when you need a lot of light... hiking or find a cathole in the middle of the night. Both settings can be gradually dimmed as needed to save on battery life, by simply holding the power button down. There is also a "strobe" flashing mode, which is great for those late night backcountry rave parties. The lamp tilts at four different levels. However, I noticed in the lowest level, the light tended to glare in my eyes.

I highly recommend not tossing out that little instruction sheet with the tiny print in six languages. The way the control button is used can be a little confusing, and actually reading the instructions can be helpful. The power source is three AAA batteries. Haven't this long enough to determine battery life, but with lithiums I would battery life should be decent. The water resistance rating is IPX4, which means it will stand up to sprayed water (ie rain), but probably not being submersed.

Despite the small quibbles, this is a great little headlamp, and I look forward to many trips with it.
Sierracanon at REI on 11/11/2013

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.

Cameron C at on 07/19/2013

Must have for every trip!

This headlamp is 100% a must have for every trip whether it is hiking, day trip, camping, or backpacking. It is always in my backpack right next to the first aid kit. So far it has come in useful for building a fire, setting up tent, and making dinner after sunset. I have used it to search for lost sunglasses between boulders in the middle of the day. The dimming feature is great when using it as an overhead light in the tent, just dim it down and throw it in the gear canopy for a nice soft lighting. Red light is great to not wake up my boyfriend when I am still awake after he heads to bed. The only part I haven't figured out is the strobe light... I just use it as a threat when my hiking buddy gets irritating (because it is obscenely bright)... That brings me to another plus, the light has a tilting function which makes for more easily reading and talking to someone with it on without blinding the other person. Ok I'm done. Bottom line this is great.
Alhofer at REI on 05/05/2013

Great value

This is a rugged little light! The white light is very good and the ability to adjust to the precise amount of light needed is fantastic. The only reason it does not get a 5 star rating is that the red light seems dim. Yes, I know the red light is to preserve your vision at night, however; it is not very useful for lighting anything much further away than your feet. Additionally the red LED is not diffused well. You get a red halo with a dark spot in the middle. If the red LED is not a must feature, this is the light for you. If you need the red light, consider a model with two red LEDs. That being said, I will be keeping this light. The white light alone is worth the money.
madmuley at Cabelas on 11/15/2013

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.

Andrew Frongillo at on 08/20/2013

Great value for a head lamp

I bought two of these headlights for our Boy Scout Jamboree trip. I really like this Cosmo model. It is very comfortable to wear for long periods, and for the price it has high end features. My favorite feature is the continuous dimming on the main LED.
My only nitpick--and it is a minor one--is that the different modes for this product are not intuitive. The instructions were well written, but let's face it, no one brings the instructions on a camp out. It only took me a couple of uses to get it down, so overall I think this is a well executed headlight design. I can definitely recommend the Cosmo headlamp!
Scoutmaster James at REI on 07/07/2013

Better than expected.

Love all the features, especially the ones I didn't know I needed - like red beam. Wondered why it even had it but in the middle of the night in the tent that I was sharing, I had to get up and I realized the red beam was just enough illumination to see what I was doing without waking up my tent mate. The adjustable beam is wonderful for reading when you need less than full strength. The only negative was that I couldn't see much difference between some of the beam patterns but that's pretty minor.
I'm loaning it to my son for his jungle adventure in Borneo.
CanoeBoy at REI on 08/08/2013

Great weight to brightness level.

I originally was looking for something with a crazy amount of lumens when shopping without being too heavy for running. This is a great balance between weight and the amount of light. In fact, it's blinding bright at brightest setting. The UI of switching between floodlight, spotlight, red-light, dimming feature and strobe feature takes a minute to figure out. However, it does all of those various things and that's awesome. Great for running and seeing in the distance but also can be tamed down for sitting around the camp fire and not blinding people. You can make it flash/strobe in the white and red-light modes.
HeyYou at REI on 10/10/2013

Very nice

Replaced a Princeton Tech Fuel with this lamp. Had my Fuel for five or six years, or more, and it was awesome...til I broke it. However, the one thing I really love about the Cosmo is the red light. Around camp, whether I'm backpacking or car camping, the red lamp is perfect. For the killer white light, I don't do any night hiking or backpacking, but if I did, I'd be happy to have this lamp. Overall, I'm very happy. I didn't give it 5 stars cause I don't give anything a perfect score. Nothing's perfect. This is a 4.5.
VinFiz at REI on 08/08/2013

Works well, although a little fiddly

This headlamp works very well and comes in very handy in many situations. The only complaint I have is that it can be somewhat fiddly to get it set to the right level of light that you want. You have to hold the button in while the lamp dims to the level you want it at. Or if you want different settings (red or flashing) you have to click it at just the right timing or it just turns on and then off. My other Petzl headlamp is much easier to set how you want it.
Feigerou at REI on 09/09/2013

Negative Reviews:

Light turns on in my backpack

Purchased this product especially for backpacking and because it had the red led option so you can retain your night vision and no blind fellow campers. First time I went to use it backpacking the batteries were low and would only stay on for a few seconds. I had just put new batteries in before the trip. Obviously due to the large on button and thinks getting crammed into my backpack the it got turned on. Luckily I had another set of spare batteries but was very disappointed that it had turned on at all. Not sure how to overcome the problem except to add some kind of protective cap for when it is stuffing in my pack. Anyone have any ideas. might be able to reverse on of the batteries but not what adverse effect if any would occur. Did not really want to do this or remove all batteries every time I stowed my headlamp.
TDD at REI on 07/07/2013

Touchy product

I use this light when I go camping. As I'm walking around while wearing it, the light sometimes just randomly shuts itself off. It seems as if moving around too much causes the mechanism to malfunction. It has a very touchy button and sometimes I have to push the button several times to get the beam/light option I want. Its kind of annoying
CHR at REI on 04/04/2013

Adequate, but not great

This is a perfectly acceptable headlamp, but nothing special. The single white and red LEDs aren't aggressively bright, and the single button controls are at best annoying. On the plus side, it's cheap and lightweight!
HobbitLasher at REI on 07/07/2013

Neutral Reviews:

Cool but with one big frustration

This headlamp was mostly used in everyday life. It was mainly kept in my purse and backpack to use when needed. I use it quite frequently, like running to the car or walking the dog at night.

Nice and bright. I loved how it would dim down too.

However, the power button was always getting pressed by whatever it was next to in my purse or bag. So the battery was constantly draining. I've had a number of headlamps in the past and never had this issue. I always had to double check that it hadn't been turned in again.

Besides that a great light. But I wouldn't buy another one.
bckpckr83 at REI on 12/12/2013

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.

Andrew Rankine at on 10/25/2013

nice features, no pad

Nice specs for the price. However, I have cheaper headlamps that have some type slim rubber or foam pad behind the lamp. This one feels like it is going to be uncomfortable to wear. I will be cutting and gluing a piece of heel inserts or chamois to the back of this lamp before my forehead gets rubbed off!

Like the beam range and diameter, dimmer, and red light features.
buddhathedog at REI on 05/05/2013

Not quite bright enough

Great little headlight, small, good battery life, durable, fits on my head well and I like the ease of adjusting the head strap. Ultimately though it JUST ISN'T BRIGHT ENOUGH FOR ME. Still I think it's a good product if you don't need super bright lighting, such as around the house, on trips with enough moon/starlight or other outlying city light.
hygroscopic at REI on 01/01/2014