The petzl nao is brimming with features and offers superb performance for any outdoor application offering 750 lumens of light output the nao really does set the standard for the finest head torches the nao differs to most other head torches by featuring reactive lighting which automatically adjusts the brightness and light output to your needs if you bring your map up to your face to investigate the route to your next camp the torch will automatically lower in intensity glance back up and th