Abstract

One of the problems involved in the operation of drive-in theaters as opposed to in-door theaters is that of illumination. For example, screen brightness levels for an indoor theater may be 12 to 16 fL, whereas brightness levels of drive-in theaters are usually no more than 8 fL. Informed selection of projection lenses will aid in improving screen illumination. Tests were made of various lenses and illumination techniques to determine the best solution of the drive-in illumination problem.

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