How is the "white channels" slide bar different from "brightness" for PWM CCT?

Questions
1

I have a WLED controller like this one and configured port 18/19 as the output for LED. However, there are both white channels and brightness bar in the frontpage which both controls the brightness. May I ask what’s the difference between these two? The white channels cannot be controlled from HA integration.

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2

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3

From a practical standpoint using a single CCT strip the two are almost identical. However, internally they take completely different paths in the software:

  • white slider controls the white color channel of the RGBW color (which is per segment)
  • brightness slider controls the global brightness (which applies to all segments)