It's been so hot here this summer that I started many of my rides a couple of hours before dawn, sometimes earlier. I use a blinky on the back but will upgrade to a design shine 500 lumen tail light when available. I use a shiningbeam s-mini(400 lumens) on an exposure helmet mount and I use an eagletac t20c2 (500 lumens, 720 lumens on turbo) on my handlebars with a rotating mount. The lights use rechargable LiIon 18650 batteries and I carry backups. I usually ride with a buddy that has the same setup so when we are out there, we are bright. The lights are light weight and powerful and have a long run time. There is a certain disappointment that comes with the sunrise as the time before dawn with its plethora of animals and absence of cars carries with it a certain magic.