Got a set from China for $20, which included a dome, vanity, map and trunk bulbs. They all look gorgeous, but I noticed that the dome light stays on very faintly when the car is shut off. I can kill to completely by the switch, but why would there be any electricity flowing to it. It's really faint, but I can still see it. Is there a capacitor in the bulbs that hold some charge? I'm going out to see if it's still on faintly. Thoughts? Any of you?