Endoscope light source apparatus

An endoscope light source apparatus comprising:

• a first solid-state light source that is configured to emit a first light beam that includes a first wavelength band;
• a second solid-state light source that is configured to emit a second light beam that includes a second wavelength band in which a wavelength thereof is longer than in the first wavelength band;
• a third solid-state light source that is configured to emit a third light beam that includes a third wavelength band differing from the first and second wavelength bands and that generates white light by being combined with at least one of the first and second light beams;
• an optical member that is configured to combine the first light beam and the second light beam with the third light beam to generate a combined light;
• an optical filter that is configured to be provided so as to be insertable into and retractable from an optical path of the combined light, and that selectively allows the light in the first, second, and third wavelength bands to pass therethrough;
• and
• a controller that is configured to control turning on and off of the first, second, and third solid-state light sources, and insertion and retraction of the optical filter,
• wherein:
• in a white-light illumination mode, the controller causes the optical filter to be retracted from the optical path, and turns on the first, second, and third solid-state light sources,
• in a first excitation-light illumination mode, the controller causes the optical filter to be inserted into the optical path, turns on the first and second solid-state light sources, and turns on the third solid-state light source so that an intensity of the third light beam becomes lower than intensities of the first light beam and the second light beam, and
• in a second excitation-light illumination mode, the controller causes the optical filter to be inserted into the optical path, turns on the first solid-state light source, turns off the second solid-state light source, and turns on the third solid-state light source so that the intensity of the third light beam becomes lower than the intensity of the first light beam.