Abstract: A circuit for driving a Light-Emitting Diode (LED) light source is provided. The circuit includes a bridge rectifier, a switch unit, a current detection unit and a logic control unit. When the arcing occurs, the current detection unit detects a current signal flowing through the set of light emitting diodes; the logic control unit is adapted for generating a corresponding control signal according to the current signal, so as to control the switch unit to switch off a path from which the set of light emitting diodes receive DC power. Thus, the arcing is eliminated or suppressed, and arcing protection is achieved. Further, after the arcing protection, the LED light source can be restarted by the circuit. A LED light source is also provided. The LED light source includes the above circuit.