I went to
And read about CRI. Very interesting and somewhat confusing. Bill is right about low pressure sodium vapor lights, CRI is 0, High pressure ones are 25.
Incandescent bulbs are considered 100. But there are caveats.
Cool white fluorescents are 62, interesting.
They have a long and interesting list. It's on the Internet, so it must be accurate.
As an aside, I got two 2' x 2' troffer lights with LEDs for free. Stuck them up in relatively dark corners of my shop. (There, I fixed it) Lets just say the results were underwhelming. They are not noticeable. I walk in and turn the lights on and am completely unaware of the new lights.
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- Fluorescent vs LED- data from experiments