dash LED's, long winded

Don't confuse combining light-produced colors with combining pigmented colors (paint). Comgining blue and yellow paint will indeed produce varying shades of green, depending upon ratios of each color. On the other hand, combining light waves does something completely different.

To prove it, you can wrap the lenses of three flashlights with separate red, blue, and yellow cellophane (plastic) films. Shine them all into one spot and you get white light. Do that with paint and you get something resembling mud.

Remember, pigments in paint are ABSORBING certain light waves, so what we perceive is the color NOT absorbed, but rather is being REFLECTED.

I thought this might help in understanding how mixing colors works. White light through a blue lens (pigment in the plastic) will still give you blue lights.

Jerry