I do my fitness rides before dawn on suburban streets that are lit fairly, poorly, and not at all, and I use a Princeton Tec EOS. It includes mounts for handlebar, helmet, and forehead. It uses three AAAs and puts out 70 lumens, and I don't need any more. Mounted on my helmet, it illuminates at least a hundred yards of whatever lies before it. I got mine for 45 bucks at REI.