Color rendering index
（重定向自Colour Rendering Index）
![Emitted light spectrum determines the CRI of the lamp.](/Images/godic/202501/05/Simple_spectroscope2402.jpg")
![Color rendering index shown as Color Accuracy.](/Images/godic/202501/05/AmbientLED2402.png")
![CIE 1960 UCS. Planckian locus and co-ordinates of several illuminants shown in illustration below.](/Images/godic/202501/05/CIE_1960_UCS2402.png")
![Chromatic adaptation of TCSs lit by CIE FL4 (short, black vectors, to indicate before and after) to a black body of 2940 K (cyan circles).](/Images/godic/202501/05/CIE_CRI_TCS_under_FL4.svg2402.png")
A color rendering index (CRI) is a quantitative measure of the ability of a light source to reveal the colors of various objects faithfully in comparison with an ideal or natural light source. Light sources with a high CRI are desirable in color-critical applications such as neonatal care, photography and cinematography. It is defined by the International Commission on Illumination (CIE) as follows: