It is the property that the appearance of color changes even for the same object depending on the light source.
When the light source changes, the same color can appear differently. This property of how the light source affects the perception of color is called color rendering. A light source is said to have good color rendering if the way colors appear is close to how they look under natural light (sunlight), and conversely, it is said to have poor color rendering if it does not. In Japan, color rendering is assessed based on the JIS color rendering evaluation method, which is based on the CIE (International Commission on Illumination) evaluation method, and is generally expressed using the average color rendering index (Ra). Generally, if Ra is 80 or above, it can be said to have good color rendering.
The difference in color rendering among light sources is due to the varying intensities of each wavelength contained in the light source. This can be understood by comparing the spectral distributions of each light. For example, natural light (sunlight) contains light of different wavelengths almost uniformly within the visible light range (380nm to 780nm), whereas white fluorescent lights have considerable variation in the distribution of the wavelengths of light they contain. The closer the spectral distribution of a light source is to that of natural light, the more similar the appearance of colors will be to those under natural light, resulting in better color rendering.
Citizen Electronics is committed to developing products that focus on color perception.
Product list: https://ce.citizen.co.jp/products/led_category
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