FYI-more to come on the “format” or “ratio” of height vs. This calculation changes if you are viewing images that require detailed inspection. That will translate for a 16:9 format image, to about an 80-inch diagonal image (that’s over seven and one-half feet!). A quick example that for a 20-foot distance you would want the screen height to be 40-inches. Not to generalize too much, but typically for a general presentation with some text, you divide the distance the furthest viewer is from the screen by 6, to give you the screen height. After you determine the brightness, you must determine the size, typically measured diagonally from one corner to the other corner of the displayed image. This is a critical aspect that must be determined in advance of your choice, be it a video projector or display. We also want to touch base on image size. This is because you can always adjust the brightness down if it’s too bright…but, and a BIG but, you cannot raise the brightness more than it is rated for! Whether you choose a video projector or video display, and in most applications when it comes to brightness, the higher the number, the better.
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