How would you suggest they do that. White light near equally activates our 3 cones because all spectrums of light are in it.

White light near equally activates all 12 shrimp cones because all spectrums of light are in it.

Which spectrum of color is left out of white light that wouldn’t light up a cone associated with it?

Why would you do that?

You have to wait for the last work in the sentence anyway so doing extra calculations to throw out later isn’t making it faster.