It would DAY! ! !

It would be the day, in the true sense of the union spotlight is so bright and the light is so good (right) split that you can (about 25-35 km / h) driving even at full darkness at full speed. When cornering, the light is not emitted wide enough and we should make a little careful (be slow).
Otherwise, the for me almost like a small motorcycle headlight (a very small but good).
The parking light function is also fine, even if the switches on the next day, he lights up still, of course, darker than in normal operation or when stopped, but it's enough to cope in the dark to come and you do not need extra flashlight.

I bought 2 headlights for 2 different bikes.
A I have operated with a Shimano XT hub dynamo DH-T780 and also had the experience.
The Second I have operated with Shimano hub dynamo DH3N20 and the headlights illuminated optically equally in parallel journeys.