Black Diamond Cosmo is a compact all-purpose headlamp with a maximum output of 350 lumens. It is suitable for hiking, camping, travelling, evening walks, household tasks and use as an emergency light in a vehicle or backpack.

Dual-Fuel technology allows the headlamp to operate with three standard AAA batteries or a separately available Black Diamond BD 1500 rechargeable lithium-ion battery. Users can therefore choose between readily available disposable batteries and a reusable rechargeable power source.

When the BD 1500 battery is installed, it can be charged directly inside the headlamp through a USB-C port. The rechargeable battery is not included in the standard package. An integrated battery meter helps the user check the remaining power before and during an activity.

The main white light uses a multifaceted optical lens to produce an even and useful beam. Brightness can be adjusted continuously to suit current conditions. Mode Memory restores the previously selected brightness when the headlamp is switched on again.

A separate red LED helps preserve night vision and limits glare for other people. Red light offers adjustable brightness and a strobe setting and can be activated through the dual-button interface without cycling through all white-light modes.

Additional functions include a white-light strobe and a digital lock that prevents accidental activation inside a pocket or backpack. A durable low-profile latch secures the battery compartment, while a practical opening tool is integrated into the headband adjustment slider.

The headlamp meets the IPX7 protection rating and withstands immersion in up to one metre of water for 30 minutes. Partially recycled construction reduces the amount of virgin material used. Cosmo provides a practical combination of useful output, straightforward controls and flexible power options.

• Maximum output: 350 lumens
• Lighting modes: white light, red light and strobe
• Brightness adjustment: continuous dimming
• Setting memory: Mode Memory
• Controls: two buttons
• Accidental-activation protection: digital lock
• Power source: 3× AAA or rechargeable BD 1500 battery
• Batteries included: 3× AAA
• BD 1500 battery: sold separately
• USB-C charging: when using the BD 1500 battery
• Battery-level indicator: yes
• Maximum stated runtime: 200 hours
• Protection rating: IPX7
• Weight: 88 g
• Size: one size
• Recommended use: hiking, camping, travel, household tasks and everyday use
• Country of origin: Thailand