Black Diamond Cosmo 300 Headlamp

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Compact, water-tight, and packing 300 lumens of power, the Black Diamond Cosmo 300 keeps the light on the trail ahead when you get caught in the dark while walking, hiking or biking.

  • Features

    • Updated optical efficiency with multifaceted optical lens not only emits brighter light up to 300 lumens on max setting, but also saves battery life
    • Updated user interface includes a second switch for lens settings, including proximity and distance modes, dimming, strobe, red night vision and a digital lock mode
    • Red night-vision LED has dimming and strobe modes that can be activated without circling back through the white modes
    • Digital lockout feature prevents accidental use when stored in a pack or pocket as a backup
    • Compact, low-profile ergonomic design with improved balance uses 3 AAA batteries (included)
    • IPX8 waterproof protection rated to operate at least 1.1 meters underwater for 30 minutes—perfect should you be caught in a downpour
    • If submerged, water may enter the battery compartment, but it will still operate; it should be completely dried out after use in wet conditions


    View all Black Diamond LED Headlamps
  • Technical Specs

    Best Use


    Bulb Type


    Bulb Detail

    White / red LED

    Red Light Mode


    Beam Type

    Flood / Spot

    Max Light Output (Lumens)

    300 lumens

    Light Output

    High: 300; low: 4 lumens

    Max Beam Distance (m)

    75 meters

    Beam Distance

    High: 75; low: 8 meters

    Brightness Levels




    Average Run Time

    High: 4 hrs. 15 min.; low: 200 hrs.; reserve: 24 hrs.


    3 AAA

    Water-Resistance Rating


    Weight With Batteries


  • Reviews
    146 reviews with an average rating of 4.6 out of 5 stars

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