The US Department of Energy has developed the lighting facts program to help consumers better understand the different attributes of lighting sources. The program has proposed a label to be added to products that explains and even illustrates the variations between the lamps. You can find more information about the label at lighting-facts.com.
The label will provide information about output, efficacy, CRI and CCT.
I’ve found this to be a great idea and would love to see this program expand to the rest of the lighting source industry.