Black Diamond Cosmo 250 Headlamp

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With a lighter, smaller, tighter waterproof body and an updated user interface, the Black Diamond Cosmo 250 headlamp handles everything from your evening bike commute to that weekend backpacking trip.

  • Features

    • Emits up to 250 lumens on max setting
    • Red night vision has dimming and strobe modes and activates without cycling through the white mode
    • Compact, low-profile design uses 3 AAA batteries (included)
    • Settings include proximity, distance, dimming, strobe, red night vision and lock mode
    • Multifaceted optical lens design
    • IPX8 rating means this is completely waterproof; it can withstand water submersion more than 1m deep for more than 30 min.


    View all Black Diamond LED Headlamps
  • Technical Specs

    Best Use


    Bulb Type


    Red Light Mode


    Beam Type

    Flood / Spot

    Max Light Output (Lumens)

    250 lumens

    Light Output

    High: 250 / med: 125 / low: 6 lumens

    Max Beam Distance (m)

    72 meters

    Beam Distance

    High: 72 / med: 50 / low: 8 meters

    Brightness Levels


    Average Run Time

    High: 6 / med: 17 / low: 200 hours


    3 AAA



    Water-Resistance Rating


    Weight With Batteries

    2.93 ounces

  • Reviews
    75 reviews with an average rating of 4.8 out of 5 stars

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