A solution is described that enables a pressurised hydraulic circuit to be made inside the channels (5) of an alveolar panel (1) the panel (1) can be made of a transparent plastic material that enables the liquid to be irradiated by external light the panel (1) in a transparent material can be used as a light exposure apparatus of a photobioreactor (14) destined to the cultivation of various types of organisms the organisms produced can be used in the fields of energy generation, pharmaceutics, cosmetics and for human or animal nutrition.
