I really love my 6 degree spot for fast road riding. This thing lets you descend like nobody's business. I have the 13 watt with the 400 ah battery. I made another 400 ah battery out of some other parts I ordered from them and saved a bit of money going that route. Anyway, between the two packs I have 9 hours of runtime which will be a beautiful thing on the 600k this weekend. I have found the 6 degree spot has enough sidespill to light signs and sides for what I need, if I was mountain biking it might be different but at 20+ I prefer the longer throw. These lights are awesome the cords are a little long and I ended up modifying mine a lot but they pretty are what they state.