System and method for irradiating a plurality of plants

A system for irradiating a plurality of plants, the system comprising:

• an irradiation system that is configured to irradiate the plurality of plants the irradiation system comprising:
• one or more controllable radiation sources and/or one or more controllable radiation filters and/or radiation concentrators, and
• a controller adapted to control operation of the one or more controllable radiations sources and/or the one or more controllable radiation filters and/or radiation concentrators;
• and
• a data processing system comprising a communication interface or input/output device for receiving/sending signals, and a processor, the processor configured to:
• receive, via the communication interface or input/output device, a ratio between chlorophyll A and chlorophyll B in at least one of the plurality of plants, and
• cause, via communication interface or input/output device, the irradiation system to irradiate the plurality of plants in accordance with a first radiation recipe during a first period of time, and in accordance with a second radiation recipe, different from the first radiation recipe, during a second period of time;
• wherein the processor is further configured to receive, via communication interface or input/output device an absolute or relative threshold value, and in response to the processor determining that the ratio between chlorophyll A and chlorophyll B is below the threshold value, cause, via communication interface or input/output device, the irradiation system to switch between the first radiation recipe and the second radiation recipe;
• and
• wherein the first radiation recipe has a higher light use efficiency, LUE, than the second radiation recipe, and/or wherein the second radiation recipe has higher shelf-life increasing properties than the first radiation recipe.