Color rendering index (CRI) is a measure that has been in place for more than 50 years and is the measure of a light’s ability to render the color of objects faithfully to reveal their true color as they would appear in ideal or natural lighting. While this standard has been unchanged in 40 years, the limitations have been widely known.
The Illuminating Engineering Society (IES) has approved TM-30-15 as a new method for evaluating how colors appear under light sources. Several individual measures and graphics are encompassed in this new method and will provide a more comprehensive depiction of how light will affect the color manifestation of objects.
TM-30-15, which is a technical report, has been approved for use. It is not currently a required standard, however, and will likely not achieve this status until its use becomes more widespread.
https://energy.gov/eere/ssl/tm-30-frequently-asked-questions; https://energy.gov/sites/prod/files/2016/04/f30/tm-30_fact-sheet.pdf; www.premierltg.com/tm30-vs-cri