These come in a torch style, but with a powerful LED. The beam is far too focused for off-road handlebar use on its own because the illuminated pool is tiny.
But, if you stick it on your head with the supplied helmet mount, it's got a great long distance punch for picking out detail. It's great for winter training on tarmac and the rubber strap with clip lock clamp is easy to attach.
Run time is good and it's great initial value compared to competitors such as the USE Joystick. Using two CR123A batteries makes long term running costs very high though, and there's no dimmer beam option. There's also a 1W version with 17hr burn time for £44.95.