The IES has put forth a new color metric standard that is far more comprehensive then the old CRI (Ra) measurement system.  It will take time, but I hope manufacturers and specifiers alike adopt the new system. For a more in depth discussion, check out this Architectural Lighting article. Below is the information from the DOE SSL Postings email: A New Method for Evaluating Color Rendition The Illuminating Engineering Society (IES) has just published an important technical memorandum, TM-30-15, which outlines a new system for evaluating the color rendition of light sources. It was developed by an IES task group that … Continue reading TM-30-15 color measurement standard