Re: use color-blindness (Score 1)

Probably won't work since the rods overlap on the colors they can receive, which is why the colorblind mix up the colors.
The red rods will pick up certain shades of blue, as will the green rods.

The blue light, unless a very deep blue, will then activate all three types of rods.

http://www.colourblindawareness.org/colour-blindness/types-of-colour-blindness/