I use a pair of these mounted upside-down on the underside of a wing type Aerofly handlebar. I can pivot or tilt the lights without any tools so they provide adequate spread and variable angle when riding the bike path through the woods at night. I have the lights set at race mode, so if I am approaching oncoming riders or joggers, I can easily reach under the bars to dim the lights without taking my hands fully off the bars. With a total output of 15001500 lumens, left and right, its probably overkill for street use, but, in my experience, when drivers see a very, very bright non-blinking light, they tend to exercise more caution because they perceive it as something much bigger than a cyclist. Ive had oncoming left turning motorists come to a complete stop almost a block away in order to let me pass. Funny, when I have the lights blinking, the opposite happens, and they try to squeeze in that left turn just as I approach the intersection, probably because they know Im a bike.
So, keep em bright and steady my friends.