演色指數為評價光源優劣的重要工具，現行的CIE演色指數已使用40多年，為針對CIE標準照明體所設計，計算公式採用CIE演色公式(CIE-Ra)，隨著新式光源的開發，舊制的CIE演色指數已不敷使用，無法正確的評價新式光源品質與預測色外貌，因此需建立新式演色指數，不僅適合新式光源(如，LED)，亦可有效預測傳統光源。

Color Rendering Index (CRI) is a predicting tool to evaluate the light sources quality. The current CRI which was based on CIE (International Commission on Illumination) standard illuminant has been used for 40 over years. However, it does not recommend its use to accurately evaluate with modern white light LEDs for its light source quality. A new color rendering index is needed to be developed when it comes to predict traditional light sources and modern light sources, e.g. LEDs, correctly.

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