I was surprised by the very high light yield. Despite my high expectations. I run it with a Dynamo Axa. Have him mounted in 78 cm height at the front carrier. I often travel at night, on my first trip, I've seen so many (real) rabbits, like never before :) My concern due to lack of close-range illumination were totally groundless, one sees quite adequate by many light even at close range! The first falling over the wheel he has survived, of course, is a lot of money away when he takes damage. But the extra security it's worth I think.