Light source device for endoscope and endoscope system

A light source device for endoscope, comprising:

• a light source capable of radiating excitation light;
• a rotating body provided on an optical axis of the excitation light and configured to rotate with a rotating shaft as a center;
• a phosphor arranged in an irradiation area of the excitation light in the rotating body, and configured to generate fluorescence by being irradiated with the excitation light;
• and
• a controller configured to:
• control irradiation intensity or irradiation time of the excitation light;
• and
• rotate the rotating body at a predetermined speed when controlling the irradiation intensity or the irradiation time of the excitation light to be a first irradiation intensity or a first irradiation time,
• rotate the rotating body faster than the predetermined speed when controlling the irradiation intensity less than the first irradiation intensity or controlling the irradiation time of the excitation light shorter than the first irradiation time;
• and
• rotate the rotating body slower than the predetermined speed when controlling the irradiation intensity more than the first irradiation intensity or controlling the irradiation time of the excitation light longer than the first irradiation time.