I just asked because i have both Sunlike 6500K and Optisolis 757 6500K and the Lightmaster G2 is saying that their CCT is like 7200-7400K with calculated duv from waveformlighting of -0.005 to -0.006. It seems like the Opple Lightmaster G2 might be overestimating the CCT and duv maybe because of the violet 420nm light from the pump.
I’ve seen similar measurements from other low-CRI 6500K LEDs. While I think Opple’s measurements are useful, they should be taken with a large grain of salt.
I have G2, G3, and G4 units, but the measurements don’t align well enough to inspire much confidence. I mainly use them to compare measurements with the ones from my reference light, and in that regard, they’ve provided some useful information.