Darryl Jones, of Eastman Kodak, informed us that a way to determine the required lumens for the selection of a digital projector is the following formula:
Image width x Image height x Foot Lamberts. For example: if the image is 20ft. wide by 12ft. high at 14 fl (normal light reflection on a matte white screen) then the calculation would be 20 x 12 x14 or 3360 lumens. So, a projector with a 3500 to 5000 lumen capacity would perform very well.
Thanks Darryl.
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