You could do what you said but it's not good for the system. Your home stereo is a 120v socket so you'd need a light accordingly. The correct and best way to do it is to buy a "light organ" kit. It's the thing you see the DJ's have that lights up to the beat of the music. This will work better, and you can have more than one color. They cost as little as $25 all the way up to several hundered. I had a kit that had 4 different lights and it only cost me $30.