I have 2 IQ Cyo's on my primary commuter. They are bright enough for most riding, but they don't provide as much light as I would like for long distance night riding, but I have bad night vision. My eyes start to feel fatigued after a few hours.

I have a Supernova E3 Pro on order to put on my new trike, since Peter (from Peter White Cycles) said this one is brighter. If that's not enough, I'll add the E3 Triple, even though he says its too bright to use on the road.