I use a Magicshine 808 "900" lumen light for early morning riding. It's not really 900 lumens, more like 650, or so I am told. On high it's bright enough to descend a dark mountain road at 30-35 mph. Cost me about $90. It and lights like it are probably the best value but if I was going to do a lot of riding in pitch dark I'd have even more illumination. There's a new "1600" lumen model out now, that might do it.