Well I have my Receiver plugged into a Belkin surge protector. I also have a light plugged into it also. The light is on top of my Cabinet. I use the light when watching movies, but I don't turn it up all the way, I just barely dim it. But I noticed that sometimes with it on the tv picture, which it run through the receiver is dimming and getting brighter a lot. Sometimes this happens with vacuum cleaners or AC's, but it seems weird with this little light. Do lights that dim cause problems? Well after this I'm going out and buying a UPS, which I'm pretty sure even with turning on vacuum cleaners the amount of power going to the receiver shouldn't change right? They keep a steady amount of power going to whatever is plugged in?