Continuing on CRI’s limitations, since 2015 the new and improved metric is TM-30’s “fidelity index” (Rf) which is calculated based on 99 samples, among many other improvements.
The larger number of samples makes it harder for an LED manufacturer to “cheat” by optimizing for the specific reflectance spectrums used to score CRI, getting a higher score while not actually rendering colors of most real world materials that well.
The larger number of samples makes it harder for an LED manufacturer to “cheat” by optimizing for the specific reflectance spectrums used to score CRI, getting a higher score while not actually rendering colors of most real world materials that well.
https://www.energystar.gov/sites/default/files/asset/documen...
Unfortnately it’s still much less popular than CRI.