evilone, you are a complete retard. When you lights dim when the bass hits by no means do you need a cap. That is not what a cap is for at all. I would suggest that you take a few electronics classes, but you would fail.
If your lights dim you will need to look into the big 3 upgrade. A cap is only going to stiffen the voltage to your amp, it is not going to stop the lights from dimming what so ever.