Need a lot of light? NiteRider's MiNewt.600 Cordless puts out up to 600 lumens for up to ten hours and weighs in at only 190 grams! Attachment is easy, too, on handlebars up to 31.8mm in diameter or on your helmet. 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!