Color Theory

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For example, the primary colors (in additive color mixing with light, as opposed to subtractive color mixing with pigments) are R, G, and B (Red, Green, and Blue). The secondary colors are C, M, Y (Cyan, Magenta, Yellow). Using basic knowledge we know that:
R + G = Y
R + B = M
G + B = C
The secondary colors can also be added to make up primary colors:
M + Y = R
C + Y = G
M + C = B
In further detail, Blue is the inversion of Red and Green; Green is the inversion of Red and Blue; and Red is the inversion of Green and Blue combined:
B = -(R + G) = -Y
G = -(R + B) = - M
R = -(G + B) = -C
This can be further proved in the following:
R + G = Y
R + B = M
M + Y = R
M + Y + B = M
B = -Y

Now, the question that I have is how do you calculate addition or change of luminosity and intensity of color when two colors are added together? For example, Y + B = white light. Y has luminosity of 98, and B has luminosity of 30. They do not add up linearly because white light has a luminosity of 100.

Does anyone know anything about this?

I also have more questions which I will bring up later in the thread.