Color rendering refers to a light sources ability to make the colors of illuminated objects appear natural or accurate. The Color Rendering Index (CRI) is currently the only internationally-standardized way to assess a light sources color rendering abilities. The CRI has shortcomings in application, however, and its problems are pronounced when applied to newer lighting technologies, such as light-emitting diodes (LEDs). Since the introduction of the CRI to the present day, alternative methods have been proposed and studied. Some methods are based on the shape of the spectral output of the source, considering broadband sources to have better color rendering than sources with spectral peaks or valley. Several proposals share the basic method of CRI, with modifications to improve performance. Still other ideas are based on measures of the gamut area of rendered object colors. The International Commission on Illumination (CIE) is in the process of developing and recommending a new metric of color rendition.
Journal of Modern Optics
colorimetry, color rendering, light-emitting diodes, light sources
and Ohno, Y.
Approaches to color rendering measurement, Journal of Modern Optics
(Accessed November 28, 2023)