Originally Posted by
mechBgon
I actually preferred having my super-thrower light mounted to the head tube, so its aim remained straight down the road despite minor steering movements. It's not necessarily bad if it suits the purpose at hand. You don't see many cars with lights that steer with the front wheels

Sure, because it is more complicated, but it has been done:
http://en.wikipedia.org/wiki/Citro%C...nal_headlights