With a maximum output of 3200 lumens (up from 2000 in the Six pack Mk4) the Exposure Six Pack Mk5 gives more light than most riders need. Reasonably, 12-1800 lumens is more than adequate for nighttime trail riding at speed. That said, the more light is better, and the Six Pack Mk5 puts out a lot. The beam is wide and even, with no noticeable hot spots or gradient. Close details and small obstacles are highly visible, as well as more of the trail ahead, meaning the even on fast straight descents, it is hard to ride beyond what the light can illuminate.
Beyond the quality of the illumination, the Six Pack has some features that set it apart from the top-level lights from other manufacturers. It is self-contained in a CNC-machined aluminum housing with lots of cooling fins, so the whole light body acts as a heat sink, providing an important temperature management for the LEDs. The level of finish is beautiful, on par with Thomson seatposts and Chris King Headsets.
The Six Pack’s weight is lower and battery life is longer than comparable lights from other manufacturers that have cords and external batteries. There are 10 different programs (details are helpfully engraved on the side of the housing) to fine-tune output and battery life, and it is esy to toggle between modes with the single-button control. . Three of those modes incorporate Exposure’s Reflex Technology, which uses an array of sensors (thermometer, inclinometer, and accelerometer) along with a digital algorithm to estimate how fast the bike is going, and adjust the light’s output accordingly. The light dims when the bike is moving slowly or uphill, then brightens automatically when the trail points down and speeds increase. This seems like the stuff of science fiction, but it works on the trail. The rider can turn on the light at the beginning of the ride and not touch it until the end.