As we know, CRI means color rendering index, which is Ra. This is a traditional color rendering index system in LED market. Which is a very important point for the SMD LED quality or DIP LED Lamps quality.
It used to measure the accuracy of color reproduction under a light source.
Normally Ra is the average of R1-R8 and the value range is 0-100. When we Ra>80, means the LED sutable for basic commercial use. When the Ra>90 that indicated this is a high quality light.
However, the key point for the Ra is the core limatation: It's only considers"tint color/pastel colors", not for red or saturated colors.
We metioned the R1-R8 before. Now we need to bring an other index, which is R9. It's the most critical yet most frequently overlooked metric in the CRI system. Specifically test the ability to deep red LED. Human skin tones, food, wood and leather all rely heavily on good R9 performance. Some people thing that when R9 and R12 value being close to 90 means the LED have a super high quality on the lighting result.
For these value, we discussed it in white SMD LED, white DIP LED or full spectrum LED.
