Petzl nao head lamp the petzl nao head lamp is great for night time adventures and camping designed with reactive lighting technology that analyses the ambient light via sensor at the top of the unit and adjusts the brightness of the headlamp to suit the conditions and the needs of the user this petzl head lamp can also be adjusted via programming that allows for the headlamps performance to be adjusted to suit the users preference completed with the petzl branding to the sides headl