In the LED circuit, CRI is a more important value, which represents the color rendering index of this illumination display. Many parameters refer to this parameter in the design, but as an important reference index, it has certain limitations. I will introduce you to the limitations of CRI, and interested friends can take a look.
CRI is not a perfect metric. In fact, it only reflects the color rendering of a light source for a small medium saturation color, and the color point of the light source is preferably close to the black body radiation trajectory, and the color temperature of the light source is neither too high nor too high. Can't be too low. In addition, CRI is not a universally applicable metric. Although incandescent lamps have an ideal CRI of 100, if one tries to identify different dark blues, one knows that the choice of incandescent lamps is highly undesirable. Because the blue spectrum is absent from the spectrum of incandescent lamps. For blue, daylight is a better choice, but if you look at deep red, then the same bluish tint may not be the best choice. In fact, no single color temperature source is ideal for color identification across the entire spectral range. People need to try to develop a measurement standard that allows color rendering performance to be applied in the most common areas.
Recently, the introduction of new light sources (especially LEDs) has led to a closer look at the key points in the CRI definition. The CRI measurement standard is not designed to measure the white light emitted by the RGB LED combination source. If CRI is applied to the LED, it may be misleading. For example, since the final CRI value is the arithmetic mean of eight special color rendering indices, the CRI value will be high even if it has poor color rendering for one or both of the colors.
Because RGB LEDs lack a large amount of yellow spectrum, they have poor color rendering for yellow, but still get a good CRI value. In addition, because the saturation of the eight standard color samples is quite low, CRI can not reflect the color rendering of the light source to high saturation color. The peaks of the RGB LED spectrum are narrow and the spacing between the peaks is large. Such a spectral distribution has poor color rendering for saturated colors outside the peak, but the current CRI definition does not make up for this deficiency.
It is well known that RGB LEDs have the potential to greatly save energy, but the lack of color rendering may inhibit their market acceptance. The small changes in the wavelength and bandwidth of the LEDs used may have a significant impact on the color rendering of such combined sources. Therefore, developers using these sources to develop lamps need an effective measurement standard to evaluate the color rendering of the product. Sex. LED luminaires that look similar to RGB combined light sources can range in CRI values ​​from very poor 40 to very good 80, not the same. Even with these values, do they really represent the color rendering of the light source, which needs further exploration.
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