Abstract: The ultraviolet therapy apparatus includes a light source part having an LED light source, a controller that controls lighting of the LED light source, an input unit that inputs a set irradiation dose of a therapeutic light to be applied to a patient on the assumption that a reference light is used for the therapeutic light, a storage unit that stores at least one parameter for modifying the set irradiation dose. The controller includes a modifier that modifies the set irradiation dose on the basis of the parameter stored in the storage unit, and a lighting controller that causes the LED light source to provide the modified irradiation dose. The modified irradiation dose is derived from a degree of effect of the reference light on a human body and a degree of effect on the human body caused by the ultraviolet light output from the light source part.

Abstract: An ultraviolet therapy apparatus having an LED light source can achieve a stable therapeutic effect regardless of the temperature of the LED light source. The ultraviolet therapy apparatus includes an LED light source configured to emit light including ultraviolet light; a controller configured to control lighting of the LED light source; and a measurement unit configured to detect change in a temperature of the LED light source from a reference temperature. The controller includes a calculator configured to calculate a modifying value for modifying an irradiation dose of the ultraviolet light on the basis of change in a degree of effect on a human body caused by change in spectral spectrum of the light due to change in the temperature detected by the measurement unit, and a lighting controller configured to cause the LED light source to emit the light on the basis of the modifying value calculated by the calculator.