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The CRI 90 cold light source is not a perfect value, in fact, it only reflects the color rendering of a small segment of medium saturation color by a high color rendering LED cold light source. Moreover, the color point of the high color rendering cold light source should be close to the blackbody radiation trajectory, and the color temperature of the CRI 90 cold light source should neither be too high nor too low. In addition, CRI 90 cold light source is not a universally applicable standard. Although the ideal high color rendering cold light source value for incandescent lamps is 100, if people try to identify different deep blue colors, they will know that choosing incandescent lamps is very undesirable. Because the spectrum of high color rendering LED cold light source lacks blue spectrum. For blue, a high color rendering cold light source is a better choice, but if observing deep red, a high color rendering cold light source with the same bluish hue may not be the best choice. In fact, no single color temperature high color rendering LED cold light source is ideal for color recognition across the entire spectral range. People need to try to develop a measurement standard that can make color rendering performance indicators applicable in the most common fields. Recently, the introduction of high color rendering LED cold light sources (especially LEDs) has prompted people to scrutinize the key points in the CRI 90 definition of cold light sources more carefully. The CRI 90 cold light source standard is not designed for the white light emitted by RGB LED combination light sources. If high color rendering LED cold light sources are applied to LEDs, it may be misleading. Due to the lack of a large yellow spectrum in RGB LEDs, their color rendering for yellow is poor, but a good high color rendering LED cold light source can still be obtained

As is well known, high color rendering cold light sources have great potential for energy conservation, but their lack of color rendering may suppress their market acceptance. Minor changes in the wavelength and bandwidth of the high color rendering LED cold light source used may have a significant impact on the color rendering of this combination of high color rendering cold light sources. Therefore, researchers using these high color rendering cold light sources to develop lighting fixtures need an effective measurement standard to evaluate the color rendering of the product. The CRI values of LED fixtures with similar RGB combination high color rendering cold light sources can range from a very poor 40 to a very good 80, which is not exactly the same. Even with these values, further exploration is needed to determine whether they truly represent the quality of high color rendering cold light sources.