We use CCT (color correlated temperature) to describe the temperature of a light source. Color temperature is conventionally expressed in kelvins (K). Color temperatures over 5000 K are called "cool colors" (bluish), while lower color temperatures (2700-3000 K) are called "warm colors" (yellowish).
Brightness is the amount of light emitted by a light source. In this case, we use a value ranging from 0 to 100 following the solar movement, adapted to the needs of the space. Values close to 0 mean a low level of light, such as at night, while values close to 100 mean the opposite.