Booker R L
J Opt Soc Am. 1978 Jul;68(7):949-52. doi: 10.1364/josa.68.000949.
An experiment was conducted in which observers adjusted the luminance of 2856 K white comparison source to appear equally as bright as a red, yellow, or yellowish-green LED alpha-numeric source. Although the present CIE photometric system predicts brightness-luminance ratios of 1.0, the ratios obtained in this experiment, for the mean observer, were 1.13 for the yellowish-green, 1.28 for the yellow, and 2.54 for the red. These results demonstrate that there can be substantial differences between photometric luminance based on the V(lambda) function and brightness as perceived visually.
进行了一项实验，其中观察者调整2856K白色比较光源的亮度，使其看起来与红色、黄色或黄绿色LED字母数字光源一样亮。尽管目前的CIE光度系统预测亮度与发光率的比率为1.0，但对于平均观察者而言，本实验中获得的比率分别为：黄绿色为1.13，黄色为1.28，红色为2.54。这些结果表明，基于V(λ)函数的光度亮度与视觉感知的亮度之间可能存在显著差异。
