It’s going to vary bin to bin anyways, but you can find tests of a 4000k 95CRI SST-20 and a bin of 6500k 70 CRI SST-20 here on the forum.
At the same 1.4A, that bin of a 6500k emitter output 581lm , while the 4000k one outputs 406lm.
That’s naked emitters with a variance of nearly 200lm due to the CCT. Throw it in a light with optics and the ~300 range isn’t too far off, despite the 600 claimed LED lumens.