Endoscope light source unit

An endoscope light source unit including a light source, for making illumination light from said light source incident on an incident end face of a light guide of an endoscope which is disconnectably connected to said endoscope light source unit, said endoscope light source unit comprising:

• an aperture device including a plurality of aperture openings of different opening ratios which are selectively positioned between said incident end face of said light guide and said light source;
• a reading device for reading endoscope-type information from a memory provided in said endoscope;
• and
• a controller for selecting one aperture opening from among said aperture openings, an opening ratio of which corresponds to said endoscope-type information read by said reading device, for making said selected one aperture opening positioned between said incident end face of said light guide and said light source, and for allowing said light source to be turned ON,
• wherein said controller prohibits said light source from being turned ON in the case where said reading device cannot read said endoscope-type information when said endoscope is connected to said endoscope light source unit.