Lighting device, lighting system, and external power source device

A lighting system comprising:

• a lighting device;
• and
• an external power source device that is electrically connectable to said lighting device,
• wherein said lighting device comprises:
• a light emitting component;
• a main capacitor that supplies electric power to said light emitting component;
• a first connector that is electrically connectable to an external power source device, and that includes a first terminal for supplying electric power from the external power source device to said main capacitor and a second terminal for discriminating a type of the external power source device;
• a first switching unit configured to switch an input-output attribute of the second terminal;
• a storage unit configured to store information for discriminating a type of an external power source device connectable to said first connector;
• an obtaining unit configured to obtain the information for discriminating the type of the external power source device by comparing a voltage value of a signal input to the second terminal within a predetermined time period with a predetermined voltage threshold when said first switching unit sets the attribute of the second terminal to an input;
• and
• a discrimination unit configured to discriminate the type of the external power source device by contrasting the information that said obtaining unit obtained with the information stored in said storage unit,
• wherein said external power source device comprises:
• a second connector that includes a third terminal that is connectable to the first terminal and supplies electric power to said main capacitor and a fourth terminal that is connectable to the second terminal and detects at least a state of said lighting device;
• and
• a power supply unit configured to supply predetermined high voltage to the third terminal.

An external power source device electrically connectable to a lighting device that includes a light emitting component, a main capacitor that supplies electric power to the light emitting component, a first connector that is electrically connectable to the external power source device and that includes a first terminal for supplying electric power from the external power source device to the main capacitor and a second terminal for discriminating the external power source device, a first switching unit that switches an input-output attribute of the second terminal, a storage unit that stores information for discriminating a type of an external power source device connectable to the first connector, an obtaining unit that obtains the information for discriminating the type of the external power source device by comparing a voltage value of a signal input to the second terminal within a predetermined time period with a predetermined voltage threshold when the first switching unit sets the attribute of the second terminal to an input, and a discrimination unit that discriminates the type of the external power source device by contrasting the information that the obtaining unit obtained with the information stored in the storage unit, the external power source device comprising:

• a second connector that includes a third terminal that is connectable to the first terminal and supplies electric power to the main capacitor and a fourth terminal that is connectable to the second terminal and detects at least a state of the lighting device;
• and
• a power supply unit configured to supply predetermined high voltage to the third terminal.