The color of sunlight itself is white, but the color of an object under the sun is determined by the colors that it reflects.ĬRI is invisible until you shine it on an objectĪs we mentioned above, the same light color can have a different spectral composition. Natural light such as sunlight is a combination of all the colors of the visible spectrum. Part 3: Color Rendering Index (CRI) measures and compares the reflected color of an object under artificial lightingįirst, a quick refresher on how color works. This is compared to a daylight or sunlight - a natural light source. In most situations, we are concerned about the color quality of artificial forms of lighting, such as LED and fluorescent lamps. Light sources can be grouped into either artificial or natural light sources. Part 2: Color Rendering Index (CRI) is used to measure artificial, white light sources What does it mean to measure the ability of something? Like test scores, CRI is measured on a scale where a higher number represents higher ability, with 100 being the highest.ĬRI is a convenient metric because it is represented as a single, quantified number.ĬRI values that are 90 and above are considered excellent, while scores below 80 are generally considered poor. This is a seemingly simple definition, but there is a lot going on, so we'll help break it down into three parts Part 1: Color Rendering Index (CRI) is a score with a maximum of 100 Put simply, the Color Rendering Index (CRI) measures the ability of a light source to accurately reproduce the colors of the object it illuminates. We've developed the following guide to help you understand what it is and how it can help you improve your quality of light. Yet, for any application where color appearance is important, CRI consideration is critical. Color Rendering Index (CRI) is an often misunderstood metric of color quality.
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