Abstract

<p>Measurement of the brightness, hue, and saturation produced by three different narrow spectral bands having dominant wavelengths of 500, 580, and 660 mµ, was made with intermittent inputs having a rate of 9.8 cps. The PCF (pulse-to-cycle fraction) was ¼, and the luminance ranged from 3319 candles/ft<sup>2</sup> down to 0.3 candle/ft<sup>2</sup>. At the higher luminance levels, the 500-mµ waveband produced the greatest brightness; the 660-mµ waveband, the lowest; and the 580-mµ waveband, an intermediate effect. As luminance decreased, the three bands finally became about equally effective around 30 candles/ft<sup>2</sup>. A range of 200 to 30 candles/ft<sup>2</sup> manifested the greatest brightness index. Whereas brightness was above expectations under some conditions, it fell below expectations under others.</p><p>The intermittent inputs also produced hue changes and desaturation. Only the 500-mµ band produced large desaturation. When the 660-mµ waveband was used and when luminance was high, hue shifts were toward colors expected of the shorter wavelengths. Only one subject experienced hue shifts for the 580-mµ band; three of the four subjects obtained hue shifts for the 500-mµ band. The results here were complex.</p>

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