So I'm trekking down a mountain with the Sunwayman V10R at nite. Well, sometimes you trek too fast and you can't stop when you want, and that's what happened me. It didn't help that the V10R's variable control ring was accidentally and randomly rotated towards dim, so I couldn't see where I was stepping sometimes. Luckily and I didn't sprain an ankle, etc. From that experience, I don't recommend anything with a variable control ring at night when your body moves alot. Luckily I had my Xeno EO3 V3 with me. Click and forget.