Hi I got one of the optoma H50's about a week ago, had a demo and it looked great no rainbow. Got it home, set up and started to notice rainbows after a few hours. Trouble is now that I have seen one I can see them all the time. Is there anyway to stop this? or is my only option to trade it against a lcd rather than a dlp. Can I be traded at all? Or have I just bought a clanger.