Evaluating Colour Quality of Lighting: Why Meta-Analysis is Needed?

The colour quality of lighting is usually assessed by psychophysical studies and the conclusions of those works are always dependent on the corresponding experimental settings. In this contribution, the meta-analysis approach for this topic is highlighted, which could derive a robust estimate closest to the truth and thus draw a more plausible conclusion. By revisiting the past work, the limitation of single-case studies and the advantage of meta-analysis methods are comprehensively demonstrated. In addition, a suggestion for sharing psychophysical data in further work is proposed.