I know there are 3 models provided by Seoul semiconductor: 3000, 4000 and 5000.
It’s obvious that 4000k is not proper in the night.
Before children go to sleep, 3000k is much better.
To be honest, I do not care about the lux(lm), because most of time I just use less than half lm. So maybe you can consider using 1/3 3000k and 2/3 4000k in the next version, and it will be some point between 3500k and 4000k in the peak lm.