NiteRider's Lumina 550 guides you safely home. This bright light puts out up to 550 lumens for up to 18 hours and weighs in at only 172 grams! It attaches easily and fits on handlebars up to 31.8mm in diameter. There are five modes to choose from: high, medium, low, energy-saving walk, and flash. You can charge it off a computer's USB port and, should you throw it in a bag for later use, the Lumina's lock out mode ensures it won't accidentally turn on and waste battery life. And, this combo features the Solas, which boasts a 2-watt LED, produces 30 lumens, and has 4 settings including a daylight safety flash mode to keep you visible to others.