If you're looking to achieve light which is as close a replication of the spectrum and CRI of sunlight then let me try and easily solve that for you.
Build My LED used to do a horticultural fixture designed to accurately replicate sunlight in laboratory conditions. They discontinued production, but you could look up their Solar-Max lights on their site through a web archive such as 'wayback machine'.
They described their Solar-Mad fixtures as follows: "If your research project or growing environment requires that you match natural sunlight in a controlled environment, this spectrum is your best choice. We developed this “white light” 5700K spectrum to replicate sunlight as closely as possible and to meet the needs of our research clients. As opposed to most LED fixtures on the market, this spectrum includes far red light to ensure phytochrome responses are similar to those which occur in the field. While other white light sources, including Fluorescent and Metal Halide, appear white to the human eye, the spectrum profiles are completely different than sunlight. This can cause numerous problems with your research and plant morphology, especially if you are trying to replicate field conditions. As the world's closest approximation to natural sunlight, this visually pleasing spectrum is fast becoming a favorite among university and corporate research labs."
It sounds as if that is what you are discussing/trying to achieve, and so you could do that by just replicating the same LED selection which I copies from their website: (20%) 3000K Warm White, (13%) 3500K Warm White, (13%) 4500K Neutral White, (13%) 5000K Cool White, (7%) 420nm Violet, (7%) 470nm Blue, (7%) 505nm Cyan, (7%) 525nm Green, (7%) 660nm Deep Red and (7%) 730nm Far Red
Here is the spectral graph of the output of that fixture:
Hope that helps!