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Discussion Starter · #1 ·
I have seen people take a projector's lumen output, and the screen gain, and the screen size, then calculate the amount of light coming off of a screen.


How do I do that, does anyone know the formula??


Thanks!!


-- Cain
 

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Discussion Starter · #2 ·
Here is the formula:


foot Lamberts = (ANSI lumens) * (screen gain) / (screen area in square feet)





[This message has been edited by Cain (edited 08-04-2001).]
 

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Actually, if you have ambient, 80 ft-L works great, although reducing it to 40 with a grey screen is even better.


It is never too bright.


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Ken Elliott
 

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No, it's not. Theaters limit there FL output to 12 because with 24 frames by second with a mechanical projector, you start seing flicker with more light. Digital projectors do not have this problem. If you can go up, say to 30 FL, the image will acquire a 3D look and a vividness you don't find in theaters. Don't shoot to be as good as film, shoot to be better!


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Robert
 
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