Worrying about spectrum is really a waste of time and energy. What is demonstrated in a laboratory does not always translate to real world. There are many factors that have an effect on plant growth and health and each factor has a different magnitude of impact. As a result of aesthetics, subjectivity, art as well as the lighting industry itself, whatever advantages/disadvantages occur as a result of spectral distribution variation, these are obliterated by the orders of magnitude differences that result from the other factors in plant husbandry, such as, for example, flow/distribution/CO2 and PAR, which make about a 1000X difference to plant health than spectral distribution could ever dream of doing. Additionally, attempting to manage spectral distribution would be a complicated affair. Therefore, since the benefits of controlling spectrum is extremely low, while at the same time it's execution is very complicated, there is no point in taking this path because the path leads nowhere. We can grow excellent plants using any spectrum we want, and no one can declare, with any validity that the results of applying one spectrum is any better than the results of applying any other.
Color is an invention of the human mind only, therefore, parameters such as Color Rendering Index have no meaning in this application because one persons invention may not satisfy anothers. No one really cares if colors are accurate. The colors must be pleasing. Accurate and pleasing are mutually exclusive when it comes to art. Arguing about what color is more accurate or is better suited to plants is like arguing about what ice cream brand has more accurate or better flavor. Truly pointless unless the subject is fashion photography or crime scene forensic investigation.
The hobby is complicated enough and there are enough things to worry about without complicating life further with things that don't matter.
Cheers,