The invention concerns a system (1) for optimizing the utilization of the available quantity of photosynthetically active radiation in the growing of one or more plants (2) on one or more growing surfaces (3a) in situations where there is an excess quantity of photosynthetically active radiation because the available quantity of photosynthetically active radiation is greater than the usable quantity of photosynthetically active radiation for the one or more plants (2), wherein the system (1) is configured to make the availablephotosynthetically active radiation of the directly incident sunlight (5) fall onto a growing area that is larger than the originally available growing area on which the directly incident sunlight would fall without the system (1), wherein this larger growing area consists of one or more separate growing surfaces (3a), and wherein the ratio between the larger growing area and the originally available growing area is equal to an area multiplier.
