Um, excuse me, but these two are continuous spectra. We've arbitrarily assigned 7 fence posts to each. According to what it says on Wikipedia, Newton actually started with 5, and then arbitrarily added two slices to his circle so he would match Aristotle's arbitrary claim about the number of fundamental colours. Of course, since you can create any colour by combining only 3 base colours to varying degrees of intensity, I'd say you only need three pieces of the continuous and infinite spectrum of visible light, which is just a tiny frequency range of a much broader thing.
Also, Mercury, Venus, Earth, Mars, Jupiter, Saturn, Neptune, UrANUS... that's 8
Unless you're not counting Earth.
Don't worry, I'm not here to debate. I think it's an interesting mental model, and a great way to build "vastness and oneness" into your meditation.
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