Its as if there is a standard for the hue of these lights. I'm not sure if there is a standard but if there is perhaps the CV tests should test only to that standard?
Yes, each aviation signal light colour has a design spectrum range that it must remain within.
But of course the super-intelligent people who design the lighting systems couldn't quite figure out that it may be a practical and safe idea to choose lights that aren't in close proximity to each other and to use colours which have dissimilar spectral properties.
So we have colours with very similar spectral properties and the Lantern Tests are designed to ensure that you are tested at those extremities.
So it was explained to me by an ex-spurt!