| 摘要 |
A control unit (50) includes: a light-level setting unit (51) that sets a target value (LSk) of the light level to be detected by a light-level detection unit (8) at each point in time in the process of a plant (1) growing toward a light-radiating unit (5) in accordance with a distance (Yk) between the plant (1) and the light-radiating unit (5); and a light-level adjusting unit (52) that adjusts the light level of light emitted by the light-radiating unit (5) so that the light levels detected by the light-level detection unit (8) approach the target value (LSk) of the light level set by the light-level setting unit (51). |
