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I wish there were some metric for rainbow effect and black levels. I had to return the BENQ6000W due to rainbows even though I seldom see them on my well-worn Infocus 4805SP. Probably the 2x brightness and increased constrast made them more visible. In any case I am considering the HD33 but I am afraid it too will have rainbows. It sounds like it has fewer but other web sites claims that they are still visible.