To summarize, I got the following R9 measurements from T10 6000K LED.
SMART version=3.7.1, R9=83 (this measurement was similar to earlier version of HOME before 3.3.1)
HOME version=3.3.1, R9=60
HOME version=3.5.1, R9=40
According to @koef3, who I believe has proper measurement equipment, the R9 of my LED in TS10 should be around 67. See here for the full review. This measurement was published a few weeks after my post above, so I was not sure which version was the most accurate at the time of writing, although I had a feeling that 3.3.1 was the most accurate from my skin test.
In addition to accuracy, I found version 3.3.1 to be the most useful because it could display Ra and R9 values for low CRI, high CCT LEDs.
I appreciate Steve’s efforts to improve the algorithm, but I believe the recent alleged improvement came at the expense of accuracy and usefulness when measuring some of my LEDs, especially those with high CCT.
By the way, is there a way to install Home version 3.3.1?