NiteRider Lumina OLED 600 Headlight. Not only is the NiteRider Lumina 600 OLED headlight a superbly crafted, exceptionally bright, self contained light, but it's also the first cycling light that takes all the guess work out of determining how much life is left in the battery. NiteRider's OLED multi functional digital display screen delivers precise battery run times as a percentage and actual time over multiple lighting levels which enables you to plan your ride safely with complete confidence. Perfect for road or trail, the Lumina 600 OLED features three steady modes and four flashing modes with a 600 lumen output on the brightest option. The light conveniently recharges via USB and mounts tool free to handlebars up to 31.8mm in diameter.