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@mouridis This is correct. NeoPixelBrightnessBus is a "novice" support class, for compatibility, while NeoBuffer is an advanced support object (like many others). None of the advanced object will honor the brightness in NeoPixelBrightnessBus.
Some background is here https://github.com/Makuna/NeoPixelBus/wiki/FAQ-%239
What you should use is the NeoBuffer or NeoDib Render method, which takes a shader that you implement the brightness support.
How do you fill the NeoBuffer?