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CRT PJ Specs vs Screen Material

Discussion in 'Projectors, Screens & Video Processors' started by cosmic023, May 5, 2004.

  1. cosmic023

    cosmic023
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    Hi All,

    Well i'm after a formula to work out ft-lamberts of my setup, i've seen a few examples.

    But then my BD801s is rated @ 900 ANSI lumens, which i know is a lot. (I'm sure it's much lower than that ??)

    I know my screen gain is 1.0 and 72" x 54" in size.

    How do i work out the ANSI - Ft Lamberts formula once i've worked out the corrected PJ ANSI output ??

    Once i knew how to work out the formula, i could then do the formula with different gain screen materials.

    Many Thanks

    Cheers

    Cosmic023
     
  2. cosmic023

    cosmic023
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    Anyone ??

    But I've seen on the AVS forum that even a Sony G90 pushes 1300 lumens and is only about 250 lumens corrected ??

    I've seen a formula like this......

    PJ lumens (Multiply by) screen gain (Divided by) Square Area of screen = Ft Lamberts

    Just wondered if there was anyone out there that could help me with the formula ??
     
  3. rob12770

    rob12770
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    Eh ?
    I think 10 lambert & butler are about £2.10 or so but I have no idea how much a twenty pack costs, sorry.
     
  4. cosmic023

    cosmic023
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    Don't worry i've had help from the AVS boys in the US and all is solved now !!
     
  5. rob_w

    rob_w
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  6. rob12770

    rob12770
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    UMMM...ok then :clown:
     
  7. cosmic023

    cosmic023
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    Cheers Rob:

    Yeah i found that link while searching for screen material retailers. (allready had the formula by then.)

    But then i did a search (In the first place), and didn't find anything, seems to make a difference on the terms used for a search ??

    Cheers

    Cosmic023
     

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