Recovery curves were run following 1- and 5-min adaptation to wavelengths ranging from 595 to 670 mμ taken at 15-mμ intervals at a luminance of 100 ft-L. The effects of near-monochromatic and broad bandwidths were investigated. Recovery curves are in terms of time necessary to return to a predetermined dark-adapted threshold and to stated values above that threshold.
After one minute of adaptation to a light of 610 mμ, recovery is faster than after exposure to an equally bright light of 595 mμ. Lengthening the wavelength causes no further reduction in recovery time. After five minutes of similar adaptation, recovery time is progressively shortened by lengthening the wavelength to 640 mμ. Further increases in wavelength result in recovery times equivalent to those of the 640-mμ adaptation. Spreading the bandwidth from near monochromatic to 30 mμ has no effect on subsequent recovery, although further broadening the bandwidth to include the shorter wavelengths results in reduced sensitivity for the 595-mμ setting. These findings are consistent with luminosity theory.
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