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Black Diamond

Cosmo

The Black Diamond Cosmo is a 350 lm, 0.19 lb headlamp. It runs on AAA and charges over USB-C.

Max output
350 lm
Beam
Not published
Weight
0.2 lb · 88 g
Battery
AAA
Black Diamond CosmoBlack Diamond CosmoBlack Diamond CosmoBlack Diamond Cosmo
Black Diamond Cosmo colors
Photo: Black Diamond (opens in new tab)

Review score

From 1 review, weighted by each site’s popularity

8.2/ 10

Select a site to leave it out.

Read the reviews: OutdoorGearLab review (opens in new tab) (May 28, 2018). Each site’s scale is converted to our 1–10 scale and averaged; more-visited sites count more (how).

Full specs

Last verified Oct 5, 2026

Unless marked otherwise, specs are from the manufacturer’s product page (blackdiamondequipment.com).

Output
Max output350 lumens
Longest runtime200 hours
Red lightYes
Power
BatteryAAA
Built-in chargingUSB-C
Size & build
TypeHeadlamp
Weight (manufacturer)0.19 lb (88 g)
Water ratingIPX7
Controls & carry
LockoutYes
ColorsClean Green, Desert Sky, Piton Purple, Black
Built forOutdoor
Warranty3-Year Warranty

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