By comparison the PX747-4K's Movie mode puts out about 1600 ANSI lumens. In Movie mode (a setting calibrated for best video performance on these two projectors), we measured the PX727-4K at about 1100 ANSI lumens. The ANSI lumen spec measures the total amount of white light a projector can produce. The PX727 can deliver white as well, but it does so by turning on all red, blue, and green channels at once, and the combination makes white. So on the 747, a lot of white light hits the screen that has not been modulated through color filters. Since the PX747-4K has a white (or clear) "filter" in the color wheel, it is able to project a lot more white light than it would be able to if it were passing all of the lamp's light through the red, blue, and green filters, as the PX727 does. By color brightness, we mean the sum total of the projector's lumen power as it projects red, blue, and green as independent colors. By white brightness, we mean the total brightness of the color "white". The reason this happens is due to the interaction between white brightness and color brightness on the two projectors. Why does this happen? Color brightness measurements This picture has more pop and vibrance on the PX727. Not only do you see a deeper color saturation, but the overall picture is actually brighter as well, and the combination of higher brightness and saturation makes the picture look obviously higher in contrast. With this type of picture the PX727 is, surprisingly, both brighter and higher in contrast. In these scenes there are typically no white elements but there is a lot of rich color. Now think about the reddish brown landscape scenes in The Martian. The picture has more pop and vibrance on the PX747. The reason is that the black levels are essentially the same, but the white lettering of the logo is much more brilliant on the PX747. When projecting this particular image, the PX747-4K looks brighter and higher in contrast than the PX727-4K. To illustrate, think about the Universal Studios splash screen, with the bright white Universal Studios logo circling the Earth with deep space as the background. In practical terms, this means that white elements in a picture will appear brighter on the PX747, while colored subject matter appears brighter on the PX727. These two color wheels present us with a trade-off between total white light output (ANSI lumens), and color brightness. What difference do the color wheels make?
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