Have taken right the first time ran hard the light. To prevent slipping on the handlebars I have however previously bound two layers fabric tape around the handlebar. So it will not budge !!! Tested on a GT Force All-Mountain with 15cm travel. Several jumps with more than one meter height difference withstand the lamp without slip (with the tape around the handlebars!). Runs down stairs - 30 steps - no problem. The battery I have stowed in the front pocket, because the Velcro holder does not look so reliable - the cable length is sufficient for good. Light output is sufficient great. Four stars because of the light cone is just around and not adapted scattering has. In narrow bends the lamp then comes up against their limits because not enough light coming left and right. A helmet lamp solves the problem ;-)
In the competition 5000 lumens are given for the same LEDs. According to my research 2000 lumens are correct ...
