Photosynthetic microorganism culture apparatus, lighting device, and photosynthetic microorganism culture method

A lighting device that lights up a fermenter in which a culture solution including a photosynthetic microorganism is stored, a light incidence region through which light enters the culture solution being formed in the fermenter,

• the lighting device comprising:
• one or a plurality of light sources that emit collimated light;
• a reflection mechanism that reflects the collimated light emitted from the light source in a predetermined direction as reflected collimated light;
• and
• a controller that causes the reflected collimated light to travel periodically in a previously-fixed direction to irradiate the light incidence region with the reflected collimated light.

A method for culturing a photosynthetic microorganism using a fermenter in which a culture solution including a photosynthetic microorganism is stored, a light incidence region through which light enters the culture solution being formed in the fermenter,

• the method comprising the steps of:
• emitting collimated light from one or a plurality of light sources;
• reflecting the collimated light in a predetermined direction as reflected collimated light using a reflection mechanism that can variably control a reflection direction;
• and
• controlling the reflection mechanism such that the reflected collimated light travels periodically in a previously-fixed direction.