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  • Multiple modes: 1 double power, 2 single power and 1 single power red
  • Red night vision mode activates without cycling through white mode
  • Settings include full strength in proximity and distance modes, dimming, strobe, red night vision and lock mode
  • The Black Diamond Cosmo Headlamp features an IPX4 waterproof rating for resistance to rain and splashes


View all Black Diamond LED Headlamps

REI membership


Best Use Backpacking
Bulb Type LED
Bulb Detail High-output LED / red LED
Red Light Mode Yes
Beam Type Flood / Spot
Max Light Output (Lumens) 90 lumens
Light Output High: 90 / low: 4 lumens
Max Beam Distance (m) 40 meters
Beam Distance High: 50 / low: 8 meters
Brightness Levels 2 + dimmer
Strobes 1
Average Run Time High: 43 / low: 150 hours
Rechargeable No
Batteries 3 AAA
Dimensions 2.25 x 1.5 x 1.5 inches
Weight With Batteries 3.2 ounces
Rated 1 out of 5 by from good LED bad switch I bought this light to use on the field whether working or playing. 3 times when I needed to use it, it did not work. The reason is simple.... Anything touching that switch will turn it on. So if you want to use it you must disconnect the batteries fumble stuff and put them back in the dark. Black Diamond, remember that we use this tools hard... and a soft switch is just not acceptable. Hopefully you can change the switches on these lights soon... the LED was great if the batteries had not run out of juice. I guess I need to go back to REI and return this.
Date published: 2015-04-10
Rated 5 out of 5 by from Excellent head lamp I've owned a few head lamps in my time, this was one of the best. We hiked into the Wind River Range Mountains of Wyoming in July and this light worked flawlessly. It has enough power to light up your night but is light weight and easy to turn on and off. I highly recommend this head lamp. Enjoy.
Date published: 2014-08-15
Rated 1 out of 5 by from Don't count on it I've had this headlamp for about two years and have found its performance unacceptable for two reasons. Most importantly, the on/off button is much too easy to press, so about 20% of the time I go to pull it out of my pack, its already on! As a result, you can never count on the batteries being good and it burns through batteries very fast. The other problem with this headlamp is that up and down adjustment mechanism is getting worn out so that every time you step off of something or move your head to suddenly, the headlamp is shining at your feet. Overall, this is a poor choice for someone who packs a headlamp with them, uses it frequently, or expects the batteries to last.
Date published: 2015-08-30
Rated 3 out of 5 by from Nice features I like the different modes and brightness. The downfalls are the housing is a little cheap, the batteries won't stay put when you attempt to close the case and the button is easily turned on when it's in my daily backpack and bumped by other items in my bag. I have a Princeton Tec and like the quality of that better even though it does not have all the features of this Black Diamond.
Date published: 2015-04-18
Rated 5 out of 5 by from Black Diamond Cosmo Headlamp Great headlamp, especially at this price point. Multi function light options, durable headstrap, long run time. 2 reviews below stating how light will turn on and off due to a sensitive push button on/off switch. This is true, however, light comes equipped with a lock function with completely solves that problem when operated correctly.
Date published: 2015-05-15
Rated 5 out of 5 by from Shedding Light As a Boy Scout on my trail to becoming an Eagle Scout, I went through many headlamps. I only wish I had discovered this beautiful lamp before I graduated out of Scouting! This not only stays on my head without falling off, it has brilliant light and lights up any and all camping situations I have taken it a long. I highly recommend this product!
Date published: 2015-01-16
Rated 4 out of 5 by from Good affordable head-lamp! This headlamp was used a great deal for a few hunting trips. Loved that it has several outputs including a red "map light" which is also great for not disturbing wildlife, especially when sneaking into turkey country. Very bright light output for camp and tent activities as well! I did not experience any "touchy" light switch issues when it was on my head. You have to press firmly to get it to turn on and off. My only bad experience with the switch was that it somehow turned on when I had it in my ruck-suck and the batteries were nearly drained after hours of being on. Luckily I was already home when I discovered this. I would recommend that you remove the batteries when storing or transporting to avoid those situations where you might be left with low batteries in the dark.
Date published: 2016-10-11
Rated 5 out of 5 by from Night reading Perfect for what we wanted. Night time reading in a two patient hospital bed.
Date published: 2014-09-25
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