I hadn't really heard of the rainbow effect causing headaches with the DLP televisions, but I did hear that the images on the TV are so bright, that you almost have to have some ambient lighting to keep you from getting a headache just watching it. Not necessarily a negative because I'm sure it depends on how close you are to the TV, and I don't always want to watch movies in pitch black rooms. Place some ambient lighting on the wall behind the TV and it would probably do the trick.