Black Diamond Cosmo 350 Headlamp — OCTANE

Black Diamond Cosmo 350 Headlamp

A versatile, waterproof everyday headlamp with Dual-Fuel flexibility for campers and hikers who want reliable light whether they're close to a power source or deep in the backcountry where recharging isn't an option. The Cosmo 350 delivers 350 lumens, red night vision, and IPX8 waterproofing in a lightweight package with an integrated battery meter so you always know where you stand.

Why We Carry It
It's the headlamp we recommend for campers and backpackers who want a capable, waterproof everyday light with the flexibility to run on standard batteries when they're far from a power source.

Highlights

• Dual-Fuel compatibility — Runs on three standard AAA batteries included out of the box or the BD 1500 rechargeable Li-ion battery sold separately. A meaningful flexibility advantage for long backpacking trips and remote travel where recharging isn't always possible but resupply is.
• 350 lumen max output with 64-meter beam distance — Enough light for trail navigation, camp tasks, and technical use in the dark. Three white modes from 6 to 350 lumens cover the full range from all-night ambient use to maximum output when you need to see far ahead.
• IPX8 waterproof rating — Tested to operate at least 1.1 meters underwater for 30 minutes. The most serious waterproofing standard in the Cosmo lineup for reliable performance in rain, stream crossings, and accidental submersion.
• Red night vision with dimming and strobe — Activated quickly with the dual-button interface without cycling through white modes first. Preserves dark adaptation for stargazing, tent reading, and any situation where maintaining night vision matters.
• Patented digital lockout — Prevents accidental activation in a pack or pocket so the battery is full when you actually need it on a long approach or a dark campsite.
• Integrated battery meter — Displays remaining power percentage so you're never caught off guard on a long trip regardless of which battery type you're running.
• 200 to 225-hour low mode runtime — Exceptional endurance on low for sustained camp use and multi-day backpacking trips where battery conservation is a priority.
• 73.5 to 79-gram weight — Light enough for trail running and long approaches without the headlamp becoming a distraction on extended use.
• 3-year Black Diamond warranty — Backed by BD's standard warranty on a headlamp built and tested by people who use them in the mountains.

Best for

Campers, backpackers, and outdoor enthusiasts who want a capable, waterproof everyday headlamp with Dual-Fuel flexibility for situations where a wall outlet isn't available. A strong everyday headlamp for anyone who spends serious time outside and wants reliable light with the backup option of standard batteries on longer trips.