Black Diamond

Black Diamond Cosmo 350 Headlamp

Our Price: $34.95
For purchase only, no demo reservations available
Product Highlights
  • Dual-Fuel Power Supply
  • 350 Lumen max output
  • Red night light
  • Digital battery life display

Dual-fuel for power supply versatility and long-lasting light

The Black Diamond Cosmo 350 headlamp features a power supply option that hardly any other headlamp has. The Dual-fuel feature means the Cosmo 350 can be powered with 3 AAA alkaline batteries (included) or the Black Diamond 1500 li-ion battery (not included). Dual-fuel capability means if you have extra alkaline batteries, or an extra battery pack, you don't have to worry about being away from a charger. A digital power meter on the side of the headlamp shows remaining battery life of headlamp power supply.

Easy on the eyes night light and lock mode

The Cosmo 350 features a lock mode to ensure that your headlamp doesn't power on in your pack during the hike into or out of the backcountry. Additionally, for those times when the 350 lumen main LED isn't needed, power on the red night-light, fully equipped with strobe and dimmer settings

Details & Specifications

Max Lumen Output:

350 Lumens


79g (3 AAA), 73.5g (BD1500), 46g (Without batteries)


 IPX8 - Waterproof for 30 mins in 1 meter of water, ensure a dry battery compartment before next use

Power Source:

3 AAA alkaline batteries (included) or BD1500 rechargeable 1500mAh li-ion battery (not included)

Max Distance:

(High) 64 m, (Medium) 45 m, (Low) 10 m

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Multifaceted optical lens design
Multiple settings for dimming, strobe, red night-vision and lock mode
Includes 3 AAA alkaline batteries
More Information
Gender All
Activity Backcountry Skiing, Mountain Trekking/Hiking, Mountaineering, Trail Running, Camping
Equipment Type Accessories
Fit N/A
Gear Category Accessories
Brand Black Diamond
Shipping Highlights

Shipping Notes:

  • Free Shipping for All Purchases Over $75
  • Expedited Shipping Options Available for All Purchases
  • 30 Day Returns For Purchases of New Items
  • Free Shipping Both Ways for Demo & Rental Orders Over $150


To see more information regarding Shipping, Returns and Cancellations please see our full policy here.

Black Diamond
About Black Diamond

At Black Diamond it's all about climbing and skiing. They share the same experiences that you do on rock, ice and snow and these experiences push them to make the best gear possible for a worldwide family of climbers and skiers. What began with a backyard anvil and a hammer has now grown into a global company with offices on three continents. Black Diamond is a company that's not just for rock climbers and skiers, but one that stands for the spirit of the sports we live, their values and goals, past, present and future. Since 1957, their innovative gear designs have set the standard in numerous areas. This is partly the result of dedication, desire and diligence on the part of an incredible team of people. It's also a product of the fact that each member of BD are climbers and skiers themselves.

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