Lighting device and lighting fixture

摘要

The lighting device of the present invention includes: a power source configured to supply power to a plurality of light sources; and a cooling control circuit configured to control a plurality of cooling devices for respectively cooling the plurality of light sources. The cooling control circuit includes a power supply circuit, a plurality of output circuits, a plurality of temperature measurement circuits, and an output control circuit. The power supply circuit outputs a constant voltage by use of power from the power source. The output circuits receive the constant voltage from the power supply circuit and supply drive voltages to the plurality of cooling devices respectively. The temperature measurement circuits measure temperatures of the plurality of light sources respectively. The output control circuit regulates the drive voltages respectively supplied from the plurality of output circuits based on the temperatures respectively measured by the plurality of temperature measurement circuits.