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"Ray" is a descriptive word, used to describe what light looks like, to the human eye. It's not a "thing" in its own right, and it's not measurable (so it can't be used in any kind of calculation), even though it's used in grammatical structures that make it look determinant.
i.e. "a pound of sugar" and "a ray of light" might look the same, and give the impression that "ray" is determinant, but it's not. It doesn't matter how big or small a ray of light is, it's still just "a ray of light".
So you can't talk about rays as if they're separate from light. They are light -- or a non-unit-ish unit of light.
I wanna be a eunuchs developer! Pass me a bread knife!