Quote - So let us make another prediction.

If I change the prop color (Diffuse_Color) but I know the numbers, I should still be able to predict the outcome.

If I also change the light color, but I know the nubmers, I should still be able to predict the outcome.

I'm making this up in real time. I'm going to choose:

Prop Diffuse_Color = RGB (212, 180, 154)
Light Color = RGB (177, 215, 199)
Prop Diffuse_Value = .775
Light Intensity = .853

So my front facing rectangle should be colored

RGB(212, 180, 154) / 255 * .775 * RGB(177, 215, 199) * .853

And the others should be in decreasing proportions based on L dot N.

I'm getting out my calculator.

Setting up your prop whilst you calculate...

Monterey/Mint21.x/Win10 - Blender3.x - PP11.3(cm) - Musescore3.6.2

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