Electric lighting bars, using light emitting diodes (LEDs) as a light source, for traffic controls and vehicle and human guidance; electric lighting luminous bars for traffic controls and vehicle and human guidance; electric light dimmers for controlling lightness, color, luminance and blinking interval of pen lights by transmitting instructions to the pen lights, using plural light emitting diodes (LEDs) as a light source, via one-way or interactive communication circuits; electric light dim...