The results we measured for the lumen output and contrast levels are a little different from the specifications from the manufacturers. Lets first look at the lumen output. We used the official ansi-lumen method to measure the lux output at 9 different points on the projection screen. The ansi-lumen method simply calculates the lumen output by looking at the average lux output of those 9 points with the projector projecting a white screen and factoring in the surface area of the projected image. We used the 6500K film mode setting, as that is commonly used for DVD playback. Because lux is lumen-per-square-meter we just needed to factor in the surface area to be able to calculate the total lumen output. We also looked at the total deviation from the center of the image and what projector has least variance in lux output across the screen.
Lumen output: 290 lumen (avg. total) x 1.518 (image size in sqm.) = 440 ansi-lumen
What is obvious from the results you see in the table is that both projectors have a lux output variance across the screen, and that, contrary to what you would expect, the highest output is not always in the centre of the screen. Most noteable is the greater output variance of the ScreenPlay 7210 and its slightly larger contrast. The ScreenPlay 7210 also has higher overall lumen output, although we are a bit skeptic about that, as we would rather have a less bright image with less variance than a brighter image with more variance.
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