A poorly positioned low quality light can even be blinding. Now it's even worse with 400 - 600 lumen systems in a more affordable price range. I make sure to steer clear of the MUP for at least 2 weeks after Christmas because that's the highest probability of running into someone trying out their brand new twin-head helmet mounted 800 lumen photon torpedos, and not understanding that you don't look at the oncoming traffic when you have one of those.
I use an Edelux on one bike and an IQ Cyo on another, and both are extremely bright but have cutoff optics to keep from blinding oncoming traffic. My Supernova E3 is a symmetrical lamp and does not afford that luxury, but I've stopped using it since getting the Edelux. Although, when I used it I kept it drive side mounted, below my handlebar bag to reduce any blinding effect by keeping it low and away from traffic.