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What are the common LED Terminologies?

Coloring Rendering Index (CRI) - CRI represents the quality of light and its faithfulness to render colors correctly, thus to enable us to perceive colors as we know them. The ideal CRI is 100, and some incandescent bulbs approach this level. LED CRI ratings range from 70 to 95
 
Correlated Color Temperature (CCT) – This is the measure used to describe the relative color appearance of a white light source. CCT indicates whether a light source appears more yellow/gold/orange or more blue, in terms of the range of available CCT is given in Kelvin (unit of absolute temperature). 2700K is "Warm" and 5000K is "Cool". The typical light color we are used to in indoor home lighting is "warm", 2700 - 2800K.
 
Lumen - a unit of standard measurement that is used to describe the amount of light contained in an area as perceived by the human eye. The more lumens, the brighter the light. You can use lumens to compare the brightness of any bulb, regardless of the technology behind it, and regardless of whether it's incandescent, CFL or LED.
 
Luminous Flux - the flow of light measured in lumens. With light bulbs, it provides an estimate of the apparent amount of light the bulb will produce. Depending on the application, much of an incandescent light is wasted because it's emitted in every direction. LED bulbs, on the other hand, put out directional light, sending all of the light exactly where it's needed.