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Was the light output from both screens measured? The darker color of the Stewart screen MAY indicate that it has a lower gain than the Da-lite. Evaluating screens without controlling for light output is similar to evaluating speakers without controlling for loudness. All other things being equal,the brighter screen (louder speaker) will typically be perceived as "better"--even by experts.

I'm not saying that the Da-lite is not in fact better, but I'm curious if any light measurement was a part of the test.