(18 LED tube detection R9 value distribution example diagram)
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The US Energy Star (DLC) requires that R9 in the color rendering index of LED lamps should not be lower than zero.
The data of the LED tube that this CLEAR plan is sampling also illustrates this point. This time, 15 models of 15 brands were sampled, and 5 models with R9≥0, the coincidence rate was about 27.8%. The corresponding indicators of these products are mostly above 80.
According to industry insiders, when designing high-color LED products, you should not only consider the general color rendering index Ra, but also pay attention to the special color rendering index R9 for saturated red. Only when Ra and R9 have higher values ​​at the same time can LED white light be guaranteed. High color rendering. 
From the results of this sampling test, LED lamps with R9 values ​​below zero are basically products with a price below 100 yuan.
From the results of the spot checks, LED lamps with R9 below zero are basically less than 100 yuan. “The R9 of domestic lamps is generally low, the main impact is the cost pressure from the packaging materials chip and phosphor.†Lu Xianui, technical director of Xuelun Technology Co., Ltd., said that the price of the guaranteed quality of the red powder on the market is over one hundred yuan. Ke, and yellow powder as long as a few dollars a gram, the price difference between the two is large, the cost increases significantly.
To improve R9 is to start from these two aspects: the first is to change the quality of the chip, select a higher bright blue chip; secondly change the proportion of phosphor. Many companies can do better, but both will increase costs.
>>>Report Download: Test Data Details 
Interpretation of CLEAR's LED tube inspection: low price competition results in a generally low R9 value
[Text / high-tech LED reporter Zhu Chunwei] When LEDs began to become popular as lighting fixtures, many manufacturers have greatly improved their color rendering index, 60, 70, 80, and some companies claim that their products are indicated as high as 90 or more. However, as an important indicator of light color rendering, red reduction (R9) has been neglected. Many lamps, especially low-end products, have negative R9 values.