Court suggested I post this notice as he'd indicated the MonkeyLink headlight was not adjustable in several Bulls reviews. The MonkeyLink 100 Lux headlight I purchased is adjustable vertically via an allen set screw at the back, underside. I haven't ridden in the dark with it yet but am very glad to have lights integrated with the Bulls battery and the display light switch. I tend to have too much fun on late afternoon rides and wind up returning when lights should be used. These lights are expensive but effective.