A Hardware MAC unit implements time-critical functions according the 802. A two-dimensional mood model divides music into four moods which include contentment, depression, exuberance, and anxiousfrantic. The solid state lighting device produces a warm white light with luminous efficacy at least 80 lumens per watt and a color rendering index at least 85 for any lighting application. The elevator car can be fixed on the guide rail piece during the horizontal displacement by a brake device. Crystal grains grown from crystal nuclei generated in the first semiconductor layer are continuously grown to form the first and second semiconductor layers, are horizontally grown to contact neighboring crystal grains, and are perpendicularly grown to form an interface with the third semiconductor layer.