Tackle 24-hour races, or night laps at your local trail network with the Exposure Six Pack Mk9 SYNC Headlight. This ultra-bright headlight takes illuminating the trail to the next level, all but banishing darkness with its whopping 4,750-lumens of glow. That's nearly 4-times as bright as your average car high beam, meaning you won't have a problem spotting what's ahead of you on the trail, but you'd be kind to pay attention to who's eyes you're pointing it towards on your ride. Since 4,750-lumens is no joke, and has been known to produce some heat as it works, the light is designed with patented circuitry that protects the lights from overheating, making sure that neither the output or longevity of the light is compromised. The light uses six ultra-bright LED's to produce this massive amount of light, backed up with a beefy 15,000 mAh Lithium Ion battery to keep you going. This battery can run for 2 hours in the brightest mode, or up to 36 hours when you run it at the much more economical 200-lumen setting. Instead of having the standard high - medium - low - settings we normally see in lights, the Mk9 uses Optimum Mode Selector, which lets you select how long a burn time you need for the ride, and adjusts the power accordingly to accommodate your riding needs, so you have just the right amount of burn time for your after-dark expedition. Taking the tech even further, the light has reflex technology that senses gradient, acceleration, and cornering forces to automatically adjust output for better visibility, while still maintaining the burntime you selected. The light recharges with ease using a USB cord (included), and has a visible gauge to let you know just how much juice the battery has left in it. Exposure is continually adding innovative new technologies to their lights, and the Six Pack Mk9 comes with Exposure's new SYNC technology, which allows the light to pair with a Bluetooth-controlled app on your phone to customize output and burn times to suit eac...