NiteRider's Lumina 550 will guide you safely home. This bright light puts out up to 550 lumens for up to 18 hours and weighs in at only 172 grams! Attachment is easy, too, on handlebars up to 31.8mm in diameter. There are four modes to choose from: high, medium, low, and energy-saving walk. Plus, you can charge it off a computer's USB port!
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I love this light, I ride alot of trails during the winter due to lack of daylight. I tend to run it on the medium setting. Walkers and Joggers on trail always know when im approaching. It lights trail up great. It is very easy to mount and slides onto/off the mount. It locks into the mount and have had no issues with it vibrating loose.Recharging does take awhile about 5 hours.