Helmet mounted Cygolite Turbo Xtra which is 740 lumens. It's extremely bright and clearly defines the roadway no matter how dark it is. The flash mode is awesome because cars suddenly know I exist. I'd like to get another powerful light on the handlebars but don't have the funds for it now. Using three Cygolite hotshots, one rear mount to the helmet, one on the seatpost, and the other on the rack.