Light source device and system

A system comprising:

• a light source device to which a plurality of types of endoscopes, each of which includes a light guide having a different outer diameter from an outer diameter of the light guide included in other of the plurality of types of endoscopes, are connectable;
• and
• a processor,
• wherein the light source device includes:
• a first light source that includes a light emitting diode and that generates red light;
• a second light source that includes a light emitting diode and that generates blue light;
• a third light source that includes a light emitting diode and that generates violet light;
• a fourth light source that includes a light emitting diode and that generates white light;
• and
• an optical member that is capable of introducing at least two of the red light, the blue light, the violet light, and green light included in the white light into the light guide of the endoscope by combining the at least two,
• the fourth light source generates the white light by using a blue light emitting diode that generates blue light and a phosphor that generates light by receiving the blue light,
• an optical path of light emitted from the fourth light source to the light guide is shorter than an optical path of light emitted from the first light source to the light guide, is shorter than an optical path of light emitted from the second light source to the light guide, and is shorter than an optical path of light emitted from the third light source to the light guide, and
• the processor is configured to perform white balance processing on a captured image signal output from an imaging element of one of the endoscopes connected to the light source device based on a type of the one of the endoscopes.