Join Date: Oct 2000
Location: Stockholm, Sweden
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Congratulations, you have just passed screen math 101!
Since you have full light control there is no doubt you do not need 52 footlamberts. 25 is more than enough and since I am assuming you are using a digital projector, remember that black level will be proportionately better in your proposed setup. Contrast will also be twice what you had before unless you were running the projector at "full open".
Note that digital projectors seldom are up to spec when adjusted for proper greyscale, usually you get some 20-30 % less in practice.