A lighting system includes: a lighting device having an LED as a light source; a lighting circuit; and a heat dissipation device configured to dissipate heat generated by the lighting device. The lighting circuit has: a power source configured to supply electric power to the LED; and a controller configured to control current which is output from the power source to the LED. The heat dissipation device has a device characteristics information providing unit configured to provide device characteristics information of the heat dissipation device to the controller, wherein the controller determines compatibility between the heat dissipation device and the lighting device, based on the device characteristics information, and controls lighting of the LED.