RGBWA color space

using Colorado Batten 72s on Cyc wall, on ION, and set fixture type as Generic LED RGBWA 8bit, so I can address each part of fixtures independently (set to Block 2 mode so use as a 3 cell RGBWA per fixture)

in color picker, moving through color range - watching on LCD for color parameters - white is never enaged, just RGB and Amber.

is there some color space math reason for excluding white?

yellow spectrum on color picker not relate well to actual colors.

also there does not seem to be a block 2 fixture option to run this way aside from using generic RGBWA approach

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