Many past studies investigating visual performance focused mainly on the effect of luminance contrast between the target and background. Other studies have suggested the importance of colour contrast on visual performance. This pilot study was designed to investigate whether visual performance in the context of road lighting can be improved by enhancing the chroma of targets. Observers were asked to detect an off-axis target with different levels of luminance, hue, and chroma on a uniform background at 1.5 cd/m2. When the target and the background were set to the same luminance, a zero luminance contrast, the detection rates were significantly lower and the reaction times were significantly longer. Enhancing the colour contrast between the target and the background by increasing the target chroma level, however, was found to improve visual performance to similar levels as those when the target was revealed by luminance contrast against the background. Such an enhancement on colour contrast can be achieved in practice using light sources with a greater colour gamut size.

中文翻译：

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道路照明：一项调查使用更大色域区域的光源改善视觉性能的试点研究

过去许多调查视觉性能的研究主要集中在目标和背景之间的亮度对比度的影响上。其他研究表明颜色对比对视觉表现的重要性。这项试点研究旨在调查是否可以通过增强目标的色度来改善道路照明环境中的视觉性能。要求观察者在 1.5 cd/m2 的均匀背景上检测具有不同亮度、色调和色度水平的离轴目标。当目标和背景设置为相同的亮度时，零亮度对比度，检测率显着降低，反应时间显着延长。但是，通过增加目标色度级别来增强目标和背景之间的颜色对比度，发现可以将视觉性能提高到与通过背景亮度对比度显示目标时相似的水平。在实践中可以使用具有更大色域尺寸的光源来实现这种颜色对比度的增强。