Light-emitting diode lamp and light-emitting diode light string

A LED light string comprising:

• a plurality of LED lamps connected in series, and each LED lamp comprising:
• a working circuit electrically connected between a working voltage and a ground terminal, and configured to provide a power control and/or a lighting control for the LED lamp, and
• a voltage clamping device connected to the working circuit in parallel, and the voltage clamping device comprising:
• a switch electrically connected between the working voltage and the ground terminal,
• wherein after the LED light string is powered up to operate, when the working voltage of each LED lamp of the LED light string is increased to exceed a reference voltage, the switch of the LED lamp is controlled to be turned on to form a conduction path between the working voltage and ground terminal, and a large current flows through the conduction path so that the voltage clamping device is configured to clamp the working voltage of supplying power to the working circuit of the LED lamp.