noun
special colour rendering index
Technical term in lighting and colorimetry; refers to a metric for how accurately a light source renders specific test colors compared to a reference illuminant.
このLED照明は特殊演色評価数が高いため、美術館の展示に適している。
This LED lighting has a high special colour rendering index, making it suitable for museum displays.
General colour rendering index (CRI); 特殊演色評価数 is a more specific metric focusing on particular test colors.
Compound of 特殊 (special), 演色 (colour rendering), and 評価数 (evaluation index). A technical term likely coined in Japanese from Chinese-derived morphemes.