Scientists didn’t study light accuracy well before the emergence of fluorescent lighting. That’s partly because most light sources were close to natural light.
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However, when efficient lighting technologies like Sodium lamps and fluorescents surfaced, people raised concerns about the accuracy of light illumination.
This kindled the interest in studying lighting accuracy in mid 20th century. Lighting experts began to explore different artificial light sources to understand their color accuracy.
One prominent organization that conducted the research was International Commission on Illumination (CIE). The organization started its work in the 1960s to establish Color Rendering Index measurement standards.
This led to the birth of the CRI measuring method, which became the global industry standard for measuring the accuracy of an artificial light source.
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A red apple appears red because it reflects red wavelengths, but absorbs others.
But not all white light sources have the same amount of red wavelength light.
As a result, under different light sources, a red apple can reflect different amounts of red light, changing its appearance.
The Color Rendering Index (CRI) measures the ability of a light source to bring out the true colors of an object. Without a high CRI light source, objects can appear faded, dull or inaccurate.
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