The IQ and Cyo (latest Premium models) have a superbly designed reflector, when you angle it so the distant beam is about 50 metres down the road then it gives a very even spread of light, right back to the front wheel. This takes some doing as there is clearly a constant fall-off of light required in order to avoid any "hot spots".
I never checked if the lights were level, I just twist them until the beam reaches down the road as far as I need. The angle is whatever it is.