A serially-connectable light string includes a first power wire, a second power wire, a first electrical connector, a second electrical connector and a plurality of light emitting diodes. The first power wire and the second power wire are arranged in parallel. The first electrical connector is connected to one end of first power wire and one end of the second power wire. The second electrical connector is connected to the other end of first power wire and the other end of the second power wire. The first electrical connector and the second electrical connector respectively include a plurality terminal portions corresponding to the first power wire and the second power wire.