Hands-on Gear Review

Black Diamond Cosmo Review

Price:  $30 List | $21.99 at MooseJaw
Compare prices at 4 resellers
Pros:  Lightweight, small size, excellent flood lighting
Cons:  Below average spot beam, disappointing low-mode battery life
Bottom line:  A good light, but caught in a no-mans land between better lights and cheaper lights
Editors' Rating:   
  • 1
  • 2
  • 3
  • 4
  • 5
Measured Beam Distance:  66 m
Claimed Distance:  65 m
Measured High Mode Run-time (ANSI):  3.9 hrs
Manufacturer:   Black Diamond

Our Verdict

While this is a good headlamp, we implore you to spend another $10 and get something like the Black Diamond Spot which has much better beam brightness and quality combined with a very respectable battery life. The Cosmo is a middle of the road kind of light. It offers average performance and average battery life at an average price. If you are on a budget, look to the Petzl Tikkina which scored slightly better for a fraction of the price.



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Our Analysis and Test Results

Review by:
Jediah Porter and RJ Spurrier

Last Updated:
Monday
May 28, 2018

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The Cosmo is a solid headlamp with good performance overall, and excellent flood lighting for close proximity use. At $30 list, it falls into a tough price range where a little more money gets you a much higher performance headlamp, like the Spot, and products like the Tikkina offer better overall performance for 33% lower price.

Performance Comparison



Trail Finding


A score of 4 for trail finding is disappointing for a $30 headlamp, and most similarly priced competitors offer significantly better performance.


Beam Distance Photos

Black Diamond Cosmo
Black Diamond Spot

In comparing the Cosmo (above left) and Black Diamond Spot (right), two products from the same manufacturer and priced just $10 apart, it is remarkable that they can vary so much. The Spot casts a much superior distance beam.

Close Proximity


The strongest performance from the Cosmo is when used around camp, or in the tent, for close proximity work. The flood beam is one of the very best of all headlamps we tested, wide, evenly lit, and dimmable from nice soft lighting for use in the tent, and brighter for use in the camp kitchen. It is worth noting that the Black Diamond Astro offers a flood beam that is nearly as good, at a price 33% lower.



Battery Life


Battery life is where the Cosmo edges slightly ahead of the Spot.



Weight


At 3.0 ounces or 86 grams, this is a compact but not ultralight headlamp. It is about the same weight as the Spot. For comparison, the featherweight champion Petzl e+LITE is less than a third the weight at 27 g.




Conclusion


This is a solid light but tough to justify buying. At $30 list it is wedged between competitors that either score much better for another $6-10 or offer the same or better performance for lower cost. The BD Spot, for example, performs significantly better for only $10 more. It has a nearly identical form factor and mass with a much better beam. On the low-end, the Petzl Tikkina offers better all-around performance at 33% lower cost.

Jediah Porter and RJ Spurrier

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OutdoorGearLab Member Reviews


Most recent review: May 28, 2018
Summary of All Ratings

OutdoorGearLab Editors' Rating:  
  • 1
  • 2
  • 3
  • 4
  • 5
 (4.0)
Average Customer Rating:  
 (0.0)
Rating Distribution
1 Total Ratings
5 star: 0%  (0)
4 star: 100%  (1)
3 star: 0%  (0)
2 star: 0%  (0)
1 star: 0%  (0)


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