I was just watching 'Hedwig and the Angry Inch' on DVD. I had all of my lights out as usual. I got up to get something to drink and I noticed that when I turned the lights on, the picture looked a lot better. The appearance of artifacts was greatly reduced. I'd say on the order of 60% or more. What does this mean? Should I watch movies with the lights on, or get some kind of other light source in my room? Should I recalibrate my tv with the new light source on?