CRI is a very common term used in LED lighting. It refers to the Color Rending Index of a certain bulb. This is among the many types of measuring units that are commonly used in the many types of lighting devices available in the market today.
In LED lighting, the CRI is used where it is the quantitative measure of how well the device is able to reproduce the colors of a specific object as compared to the perfect light source. To understand CRI, the ideal light source must be understood. This is a direct reference to the best and most natural ideal light source which is that which comes from the sun.
The sun produces the CRI of 100. When the light source from the sun is at its optimum, the human eye will perceive the best color combination of any object it sees. The CRI of any lighting device will then be used to compare on how well they stack up against each other which means that the closer they are to 100, the better the illumination will be.
Each LED bulb or tube will produce a certain CRI where the closer they are to 100, the better the clarity it will be. This means that for a typical T8 LED tube that has a 75 CRI, it is able to produce up to 75% the best possible color rendering of the object as compared to those seen under the perfect sunlight.
In comparison, LED lights are able to offer much higher CRI as compared to traditional incandescent lights. This is the main reason why LEDs are commonly perceived as the ideal replacement for conventional lighting. However, most LEDs in the market currently do not have CRI of more than 90 but that is sufficient to produce better lighting and clearer lights for the surrounding areas than the traditional options.