No, you're wrong about CRI; it is a measurement of the "ability of a light source to reveal the colors of various objects faithfully in comparison with an ideal or natural light source." Plants have evolved on natural light, that's a fact, and grow very well when natural light is closely matched by artificial lighting, meaning high CRI lighting. Sunlight has a CRI of 100. Neither does a low CRI make it appear yellowish "The CRI of a light source does not indicate the apparent color of the light source; that information is given by the correlated color temperature (CCT). The CRI is determined by the light source's spectrum.".
I know you won't take my word for it, so these are wikipedia quotes:
https://en.wikipedia.org/wiki/Color_rendering_index
Like I said, the discussion is not that you can grow most plants with about any lighting, providing it is bright enough. About 99% of aquarists fall in 2 groups, you have the ones that like pink/blue/multi colored carnival lighting and then the ones that want natural lighting. Next to nobody in the latter group wants to see their tank with low temperature, low CRI, yellow or greenish flat looking colors, when there are better options. I provided the OP how to get lighting which will grow plants great and look great at the same time, in the $20-$50 range (depending on which type of plants he wants)
Responses keep coming 'there are so many other/better options', do you have a better recommendation ? Great, post it, keep in mind, he wants cheaper lighting, not more expensive, and ' go to the hardware store buy the cheapest light, whatever' isn't great advice.