Dynamo Lights

I love my schmidt son/edelux combo. The drag is just noticable on the stand spinning the wheel when you switch the light on and off. When riding i don't notice it at all on my tank of a surly. Maybe if you were doing night TTs it'd matter tho ;)
Light output is unreal, i have the version that clips the top of the beam to stop it dazzling cars. Even pointed straight down in front of the wheel it chucks out a ton of light.

From what lights did you upgrade from and how have you mounted the edelux?