CRI v/s TM-30-15
For more than 50 years, color reproduction (CRI or IRC) has been measured by comparing a light source against an ideal light source (CRI = 100), the cri is a unit that basically measures the ability to A light reproduce the colors of an object when it is illuminated, as faithfully as possible compared to an ideal light.
Over the years, technology has evolved, so new equipment and test methods have been discovered to analyze new light sources such as smd led, cob led etc.
Through various studies in 2015, IESNA (society of lighting engineers in North America) developed a method to analyze the behavior of the color reproduction of an object when it is illuminated with LED light sources known as TM-30-15.
This method analyzes the light source against 99 color samples (instead of 8 that were used to compare the CRI), with this method three variables are analyzed:
Rf: color fidelity index; This indicates whether the light source is close to natural or not (similar to CRI 0-100)
Rg: Color Gamut Score; This reflects whether the light source is over or under saturation (Rg = 100 no change, Rg> 100 over saturation, Rg <100 under saturation)
Color vector graphic; and this represents what color it has to saturate or not when objects are illuminated.
In the following image you can see the comparison of different values.As you can see the “C” luminaire, it has better color fidelity, and does not saturate.
On the other hand, the “A” luminaire has a poor color fidelity (Rf = 64) and additionally saturates (rg = 120), and to identify which color is saturated, just look at the pie chart and you may notice that the green color is the one that is affected by that is that in the image plants are seen as bright green