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The CRI 90 cold light source is not a perfect value, in fact, it only reflects the color rendering of the high color rendering LED cold light source for a small segment of medium saturation color, and the color point of the high color rendering cold light source is best to be close to the blackbody radiation trajectory, and the color temperature of the CRI 90 cold light source is neither too high nor too low. In addition, the CRI 90 cold light source is not a universally applicable standard, although the high color rendering cold light source value of the incandescent lamp is the ideal 100, but if you try to identify different dark blue, people will know that the choice of incandescent lamp is very unsatisfactory. Because of the lack of blue spectrum in the spectrum of high color rendering LED cold light source. For blue, a high color rendering cold light source is a better choice, but if you look at deep red, then the same blue tone of high color rendering cold light source 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 spectrum. People need to try to develop a measurement standard, so that the color performance indicators can be applied in the most common areas of the recent introduction of high color rendering LED cold light sources (especially LED) has made people look more closely at the key points in the definition of CRI 90 cold light sources. The CRI 90 cold light source standard is not designed for the white light cast by the RGB LED combination light source, and if the high color rendering LED cold light source is applied to the LED, it may cause misleading. Because RGB leds lack a large yellow spectrum, they have poor color rendering for yellow, but still get a good high color rendering LED cold light source. It is well known that high color rendering cold light sources have the potential to greatly save energy, but the lack of color rendering may inhibit their market acceptance. Small changes in the wavelength and bandwidth of the high color rendering LED cold light source used can have a significant impact on the color rendering of this combined high color rendering cold light source, so developers using these high color rendering cold light sources to develop lamps need an effective measurement standard to evaluate the color rendering of the product. The CRI value of LED lamps that look similar to RGB combination high color rendering cold light sources can range from a very poor 40 to a very good 80, which is not the same. Even with these values, whether they really represent the good or bad color of high color rendering cold light sources needs to be further discussed.