The Exposure Race MK15 is the ideal solution for XC racing, with an impressive output & no compromise on technology in this sleek unit. Reflex Technology means this featherweight light still packs a punch on the trail, but lowering the output allows the light to have crossover appeal for those who also have a rural commute. Reflex automatically adjusts the light to provide boosted output when riding hard & fast then intuitively dimming for the slower sections such as climbs. This is all to optimise battery capacity, to provide extra light when needed & save it when not required. Reflex achieves this by using data from 3D digital accelerometers including gyroscope & thermistors. It continually analyses the data to make seamless adjustments to benefit the rider, probably better than the rider can. In reality it is a form of artificial intelligence. The selected run time will be achieved by averaging the output over the period.