For a bright set of head and tail lights that will stay securely in place, grab this combo from Cygolite. The flashing tail light is visible for well over half a mile, even in the daytime. 700 lumens may not be the highest number on the market, but the lens keeps the light controlled. No need to use batteries—all it takes is a USB charge that will last more than 100 hours. This set is also water-resistant, which is particularly valuable when your afternoon ride becomes dark and damp.