The MaXx-D Mk15 Gun Metal Light is built for ripping through the trails or single track, a combination of 3 spot lenses launch light far down the track and a spread beam highlights the trail edge. REFEX ++ automatically provides the perfect output for any change in speed or terrain. The Maxx D is backed up with 4600 measured lumens to be at one with any terrain.REFLEX: Reflex automatically adjusts the light to provide boosted output when riding hard and fast then intuitively dimming for the slower sections such as climbs. This is all to optimise battery capacity, to provide extra light when needed and save it when not required. Reflex achieves this by using data from 3D digital accelerometers including gyroscope and thermistors ... More info