In this work, the correlation between the whiteness of lighting and the preference for the colour of lighting was comprehensively investigated based on four psychophysical studies. Different sets of experimental light sources, two of constant correlated colour temperatures (CCT) and two of different CCTs were adopted to illuminate multiple experimental objects with different illuminance levels (200 lx or 500 lx). The observers were asked to rate their colour preference towards the illuminated objects and rate their white perception towards the illuminated environment of the empty light booth. It was found that for the studies with same CCT but different chromaticities, people indeed preferred whiter illumination. However, for the cases with multiple CCTs, that statement is only valid between 2500 K and 5500 K, since too white a light source impaired colour preference. In addition, based on the whiteness rating data, the performance of three typical metrics for white lighting was assessed. The findings of this study may contribute to a deeper understanding of colour and whiteness perception in lighting, especially for lighting designers and manufacturers.

中文翻译：

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白光和颜色偏好，第 1 部分：相关性分析和指标验证

在这项工作中，基于四项心理物理学研究，综合研究了照明白度与照明颜色偏好之间的相关性。采用不同组的实验光源、两种恒定相关色温（CCT）和两种不同的色温来照射具有不同照度水平（200 lx或500 lx）的多个实验对象。观察者被要求评价他们对被照明物体的颜色偏好，并评价他们对空灯箱的照明环境的白色感知。结果发现，对于色度相同但色度不同的研究，人们确实更喜欢更白的照明。但是，对于具有多个 CCT 的情况，该语句仅在 2500 K 和 5500 K 之间有效，因为太白的光源会损害颜色偏好。此外，根据白度评级数据，评估了白光照明的三个典型指标的性能。这项研究的结果可能有助于更深入地了解照明中的颜色和白度感知，尤其是对照明设计师和制造商而言。