The Gloworm XS is the flag ship model by Gloworm. The XS retains the small form factor expected of a Gloworm but with a powerful 2200 lumen output. The XS can be mounted on either bar (with the included QR Mount) or helmet, and is so lightweight it can even be worn with a head strap! This light is ready for anything you can throw at it, a perfect combination of brightness, weight, runtime and value. The XS is poised to make waves in cycling community. Special modes are activated by holding down the button for 2 sec. This allows the user to conduct any outdoor activity without having to cycle through the special mode and having an interruption of a steady light beam. Additionally, the X2 is shut down by holding the button for appx 5sec. IMT gives you the flexibility of refined programmes and modes without needing to access them every time you go from High mode back to low. The Gloworm XS has one of the best light output vs. size vs. weight ratios in the world (Light head is only 110g).