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Color Rendering Index (CRI)
Color rendering is used to describe how a light source makes the color of an object appear to human eyes and how well subtle variations in color shades are revealed. It helps to judge how powerful it is for a light source to reproduce the colors of various objects faithfully in comparison with an ideal or natural light source.
Color Rendering Index (CRI) is a scale from 0 to 100 percent indicating how accurate a "given" light source is at rendering color when compared to a "reference" light source. It is measured as a number between 0 and 100. Generally speaking, the higher the CRI is, the better the color rendering ability can be. For example, a 2700K ("warm") color temperature incandescent light source has a CRI of 100. One 5000K ("daylight") color temperature fluorescent light source has a CRI of 75 and another with the same color temperature has a CRI of 90.
Before choosing LED tubes, you should learn more on CRI firstly. Some marketers use differing color temperatures as a reference to attain 100% CRI, when the actual CRI would be much less than 100% if noon day sun light was used as a reference. Many products marketed as 'natural sunlight' light sources are far from noon day sun.