LEGIBILITY OF VARIOUS SIZED LETTERS UNDER AVIATION RED, LUNAR, AND NEUTRALLY-FILTERED INCANDESCENT WHITE LIGHTING SYSTEMS.
NAVAL AIR DEVELOPMENT CENTER JOHNSVILLE PA AEROSPACE CREW EQUIPMENT DEPT
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The legibility of various sized letters was evaluated under Aviation Red, Lunar, and Neutrally-Filtered Incandescent White lighting using a simulated instrument panel. Seven brightness levels were employed 0.005, 0.01, 0.05, 0.10, 0.15, 0.19 FT-L, and the maximum brightnesses obtained at the rated voltage of the lamps. Legibility was significantly better under Aviation Red than either of the white systems. There was no significant differences between the white systems. Increases in performance were found above brightness levels previously reported. It is recommended that work be continued on legibility under various types of lighting using different test material. Author
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