Re: Interior Light Noise... Since the lights dim and stuff, theres obviously some electronics behind it. I wouldn't be suprised if those electronics are located near the bulb and this is what you are hearing. Its been a while since I looked at the circuits that did dimming and stuff, but usually theres a component that mounts against a heatsink that provides the switching of the power, and these can sometimes vibrate or make electrical noise if they have been knocked about a bit or have come off their heatsink. If it is on the way out, wait for the pop and the escaping of the magic smoke that does all the work. Can be quite entertaining!