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#### pepar

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Could someone please point me to the formula for calculating the reflected light from the screen in a FPJ setup. I remember it's got something to do with PJ lumens, screen size and screen gain, but can't seem to find it anywhere.

TIA!

#### CalypsoCowboy

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lumens * screen gain / screen size in sqft

for example

600 * 1.1 / (80 * 45 / 144) = 26.4

As for one step further and what ft-ls to shoot for. I haven't a clue. I know you don't want under 8 or 9, but I've heard good is 10-11, 16, or even as high as 20.

#### pepar

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Quote:
 Originally posted by CalypsoCowboy lumens * screen gain / screen size in sqft for example 600 * 1.1 / (80 * 45 / 144) = 26.4 As for one step further and what ft-ls to shoot for. I haven't a clue. I know you don't want under 8 or 9, but I've heard good is 10-11, 16, or even as high as 20.
Bingo! Thank you.

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