The Zenith: 2000 lumens, long reaching, wider beam, for an hour or combined with rapid mode change technology, TAP, that you can use the 2000 lumens when cascading downa steep, fast descent or tackling a technical trail and then TAP to lower the lumens and increase the run time.Quickly switch between modes on helmet lights by tapping either the body of the light or the helmet without needing to locate the function button for fast control to match the pace of the trail.