The lightness of a color has to do with how much white or black is mixed into it. White reflects light, while black absorbs it. So adding white makes a color lighter and more reflective, while adding black makes it darker and more muted. Light pink and sky blue are more energizing than burgundy and navy because they reflect more light, imbuing a space with life. Dark, desaturated colors absorb light, bringing down the energy in a space.
