You may want to either try cleaning the front lenses or replace the whole thing...SC 400 are notorious for getting cloudy/foggy headlights and can affect the lighting coming from your headlights. I recently replaced mine and not only is the lighting better it looks way better too...
You can also try getting some brighter bulbs or halogens...cost a lot more but the ice blue lights look great! you can probably find a nice set up for around $250-350
Cost: $250 per headlight brand new (E-Bay)
see pics...