There is provided an illumination system (100) for cultivation of aquatic animals. The illumination system (100) comprises at least one light source (110) emitting light, at least one light driver (120) arranged to drive the at least one light source (110), at least one light sensor (130) providing illuminance data for at least one point of interest (50) in said illumination system (100), and a controller (140). The controller (140) is adapted to provide control signals to the at least one light driver (120) driving the at least one light source (110) to emit light of a desired illuminance at the at least one point of interest (50). An ambient light sensor may be applied to determine control signals also in accordance with ambient light data.
