| 摘要 |
A light source apparatus for an endoscope system comprises a light source, a light reduction unit, and a light guide. The light reduction unit has a light-passing area that is exposed to light from the light source. The light-passing area has a transmittance that is variable. The light guide illuminates an incident light through the light reduction unit, to a photographing subject. The transmittance is set based on a quantity of light emitted from the light source that varies with respect to a time of use of the light source.
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