Black Diamond Cosmo 350


The Cosmo 350 Headlamp can run on either alkaline batteries or a rechargeable battery, has a super-compact, watertight body and 350 lumens of power at its highest setting that making it ideal for urban adventures and overnighters in the outdoors, even in the rain or during an unexpected downpour. Features include a secondary switch for easy mode selection, red night vision, dimming, strobe and lock modes, optical efficiency for a brighter light and longer battery life and a Brightness Memory that remembers your last setting.


  • Dual-Fuel: Power with three AAA Alkaline cells (included) or the rechargeable BD 1500 Li-ion battery and charger (purchased separately, available soon) for maximum flexibility
  • Emits up to 350 lumens on max setting
  • Red night vision has dimming and strobe modes and is quickly activated with dual-button interface
  • Settings include dimming, strobe, red night vision and lock mode
  • Digital lock mode feature safeguards against accidental use when stored in a pack or pocket
  • Integrated battery meter display shows % of power remaining
  • Multifaceted optical lens design provides brighter light and extends battery life
  • IPX8: Waterproof-Tested to operate at least 1.1m underwater for 30 minutes. If submerged, water may enter the battery compartment and it will still operate; it should be completely dried out after us in wet conditions.


Maximum Output 350 Lumens (high), 175 Lumens (medium), 6 Lumens (low)
Beam Range 64m (high), 45m (medium), 10m (low)
Burn Time AAA: 3 hours, Reserve 30 hours (high)
6 hours, Reserve 4 hours (medium)
200 hours, Reserve 0 hours (low)
BD 1500 Li-ion: 5 hours, Reserve 2 hours (high)
10 hours, Reserve 0.5 hours (medium)
225 hours, Reserve 0 hours (low)
Water Resistance (IPX Rating) IPX8
Weight with Batteries 79g (3x AAA), 73.5g (BD 1500 Li-ion)
Batteries 3 x AAA (included) or BD 1500 Li-ion