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Sushil, we can only measure the sample we have, and we cannot make any representation that the samples are representative of the entire production run. On our particular units, our UHD50 test unit meausured about 15% brighter than the 51A, but ony in the maximum Bright mode. In video modes they were only 6% apart, which one could attribute to manufacturing variance. But to be honest, even a 15% lumen variance in video is very difficult to see with the human eye; you need a light meter to detect it.