The colour temperature determines how warm or cool the light is. The choice affects the feeling created in the room and in what way the illuminated space is perceived.
2700K is often felt as soft and dampened while 3000K is more crisp and clear.
A warmer colour temperature amplifies surfaces that have a warm tone, e.g. wood. While a cooler color temperature reinforces the cold color scale, e.g. a grey cabinet door.