NiteRider's Lumina 600 OLED & Sabre 35 Combo will guide you safely home. The bright headlight puts out up to 600 lumens for up to 21 hours and weighs in at only 172 grams! It attaches easily onto handlebars (up to 31.8mm in diameter) or a helmet so you can be ready to head out the door in no time. 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 Sabre 35, which boasts 16 LEDs, producing 35 lumens, with side lighting and a daylight safety flash mode to keep you visible to others.