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what is CCT
  CCT is short for 'Correlated Color Temperature'.

   Correlated Color Temperature is a characteristic used to describe the color of visible light

   It is based on the color given off by a glowing hot piece of platinum. For instance, heat the metal to "red hot" and its temperature describes the red color. Heat it more and you get "yellow hot," "white hot," eventually even "blue hot."

  Color temperature is conventionally stated in the unit of absolute temperature, the Kelvin, having the unit symbol K.

     Color temperatures over 5,000K are called cool colors (bluish white), while lower color temperatures (2,700–3,000 K) are called warm colors (yellowish white through red).

     Lighting Matrix use of LED Color Temperature
    To simplify the selection of LED light bulb color temperatures Lighting Matrix uses the following definitions for various color temperatures:
    Warm White: typically from 2600 Kelvin to 3500 Kelvin, Used in many residential and romantic applications like hotels.
    Cool White: typically from 6000 Kelvin to 6500 Kelvin, Used in many industrial and commercial applications like hospitals.
              LED Candle Bulb (Warm White)                                        LED Tube light (Cool White)