Color Temperature or Correleted Color Temperature (CCT) is measured in Kelvin (K) and indicates whether a lamp has a warm or cool color appearance.

The incandescent lamps are considered warm light sources, because they  have a low color temperature (2700K) and their color appearance is  more  the red/ orange/ yellow range.

In the other hand, the fluorescent lamps are considered cool light sources,  because they have a high color temperature (>4000K) and their color appearance  is in the blue range.

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