According to the present disclosure, a first optical system includes a first light source and emits a first illumination light. A second optical system includes a second light source and emits a second illumination light. A controller controls turning-on/off of the first light source and the second light source. The first optical system and the second optical system are configured such that a first illumination standard is satisfied by the first illumination light and the second illumination light. The first optical system is configured such that a second illumination standard is satisfied by the first illumination light. The controller allows the turning-on of the first light source when the turning-on of the second light source is disabled, and prohibits the turning-on of the second light source when the turning-on of the first light source is disabled.