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Thank you for the reply!

Off course, context could prove helpful, although I felt it was a bit much, so I focused on a specific test-case before.
I'll outline the target effect:

I would like to achieve a pixelised dithered lighting effect.

The following features would be needed to have the full ...

Having experimented some more I have made an extra observation.

It turns out the excess Red values in my test are somehow related to the color value of the U=0 V=0 position in the texture.
Flipping the RGB test texture horizontally, the same effect occurs;
Only then, there is an excess of Blue in ...

I fear I need someone to straighten my misconception.

My goal is to let the U component of a Texture Sample depend on the Attenuation value.
See attached screenshot for a testcase.

I cannot make sense of the output here.
I was expecting to see the same colors as in the sampled texture:
Blue ...