Petzl ACTIK CORE Headlamp – Powerful, Rechargeable 600 Lumen Light with Red Lighting for Hiking, Climbing, and Camping RELIABLE PERFORMANCE: With Petzl’s 50:50 Brightness-to-Burn-Time ratio, your Petzl headlamp will retain 50% of its original brightness halfway through the Burn-Time, rather than the 20-30% brightness you get in other brands.