A plasma lighting system comprising: a magnetron including a plurality of vanes having accommodating recesses at upper and lower end portions and two pairs of straps (344, 345) accommodated in the accommodating recesses such that they are respectively and alternately brought into contact with the accommodating recesses, said magnetron providing oscillating microwaves that have an oscillation frequency determined by the plurality of vanes and the straps (344, 345); a waveguide connected to the magnetron and having a waveguide space to deliver the microwave; an electrodeless bulb charged with a luminous material and emitting light according to the microwave; a resonator formed to have a mesh form and having a resonance space accommodating the electrodeless bulb and connected to the waveguide; a power source unit configured to convert commercial power into a driving voltage and a filament current and apply the same to the magnetron according to a control signal; a light detection unit configured to detect light emitted by the electrodeless bulb; and a control unit configured to output the control signal to the power source unit and to provide control to apply a filament current, that has a lower magnitude than that applied at an initial starting stage, to the magnetron when a pre-set normal state arrives, wherein the distance between a vane which is not in contact with the straps, among the plurality of vanes, and the straps is formed such that the oscillation frequency ranges from 2,480 MHz to 2,490 MHz, wherein the power source unit applies a pre-set first current as the filament current at an initial starting stage, and changes the filament current into a second current, which is smaller than the first current, or lower and applies the same in a pre-set normal state, wherein the control unit compares the number of pulses of the detected light and a reference number of pulses, and when the number of pulses of the detected light is greater than the reference number of pulses, the control unit determines that the plasma lighting system is in a normal state. a magnetron including a plurality of vanes having accommodating recesses at upper and lower end portions and two pairs of straps (344, 345) accommodated in the accommodating recesses such that they are respectively and alternately brought into contact with the accommodating recesses, said magnetron providing oscillating microwaves that have an oscillation frequency determined by the plurality of vanes and the straps (344, 345); a waveguide connected to the magnetron and having a waveguide space to deliver the microwave; an electrodeless bulb charged with a luminous material and emitting light according to the microwave; a resonator formed to have a mesh form and having a resonance space accommodating the electrodeless bulb and connected to the waveguide; a power source unit configured to convert commercial power into a driving voltage and a filament current and apply the same to the magnetron according to a control signal; a light detection unit configured to detect light emitted by the electrodeless bulb; and a control unit configured to output the control signal to the power source unit and to provide control to apply a filament current, that has a lower magnitude than that applied at an initial starting stage, to the magnetron when a pre-set normal state arrives, wherein the distance between a vane which is not in contact with the straps, among the plurality of vanes, and the straps is formed such that the oscillation frequency ranges from 2,480 MHz to 2,490 MHz, wherein the power source unit applies a pre-set first current as the filament current at an initial starting stage, and changes the filament current into a second current, which is smaller than the first current, or lower and applies the same in a pre-set normal state, wherein the control unit compares the number of pulses of the detected light and a reference number of pulses, and when the number of pulses of the detected light is greater than the reference number of pulses, the control unit determines that the plasma lighting system is in a normal state.