Petzl Nao RL Headlamp An ergonomic, ultra-powerful and rechargeable headlamp featuring REACTIVE LIGHTING technology. The NAO RL rechargeable headlamp is an iconic trail and ultra-running lamp, that provides 1500 lumens of brightness and weighs just 145 grams. Comfortably balanced, the headband is easily adjustable and maintains excellent support throughout long and committing races. With REACTIVE LIGHTING technology, the brightness level automatically adapts to the ambient light, minimizing manual operation and optimizing burn time. Additionally, red lighting at the rear of the headlamp allows you to remain visible at night.