Originally Posted by canklecat

Nope, clear lens. It's highly concentrated to be most visible when directly behind the bike. Theoretically this should nudge tailgating drivers off to the side, where the intensity falls off. But it comes at the cost of side visibility.

I've noticed similar patterns with other riders using the Hotshot 80 in local nighttime group rides. It's uncomfortable to ride directly behind them because the light is so intense -- really too much for group rides, and there's no way to turn down the brightness on anything but steady mode. I'm not sure the textured or Fresnel type lens makes much difference.

Apparently automobile makers and nations can't reach any consensus on SAE vs ECE standards for headlights, so we probably won't see any standards for bicycle lights to settle which is supposedly the most effective.

So I'm going with the more individual, separate is better theory. I also use older style combination LED taillight/reflectors on both bikes. While less bright overall they have better side visibility. And I use a Blackburn 2'Fer in red flashing mode on the back of my helmet. And I plan to add more for side visibility.