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In LED lighting, the requirements for R1 to R15 are usually greater than 90 for the full spectrum. This requirement ensures that the light source can provide spectral characteristics close to natural light. It results in high color rendering and color reproduction.

The color rendering index (CRI) of full-spectrum LEDs has specific requirements. Ra, the average value of R1-R8, generally needs to be greater than 95. Additionally, the special color rendering index R1-R15 also needs to be greater than 90. The light source must reduce well to display red, green, blue, and other colors. This ensures the true representation of the color of the object.

In addition, some literature states that the color rendering index of full-spectrum LEDs is close to 100, i.e., Ra≥97, R1-R15≥90. This further emphasizes the need for a high overall color rendering index in full-spectrum LEDs. Individual color rendering indices are also important. These ensure that the light source behaves as closely as possible to natural light in different colors.

In summary, the requirements for R1 to R15 in full-spectrum LED lighting are greater than 90, which is to ensure that the light source has high color rendering and good color reproduction, so as to provide a light environment close to natural light