A light source (2) including a plurality of LEDs (4)； a light detector (3) that detects intensity of light emitted by the plurality of LEDs (4) as light intensity distribution of light emitted by the light source (2)； and a light intensity distribution control circuit (6) that controls current, by which each of the plurality of LEDs (4) is driven, such that the intensity of the light emitted by each of the plurality of the LEDs (4), which is detected by the light detector (3), falls within a predetermined range.
