The invention relates to a device (1, 31) for providing light therapy to vegetation cover or masses of algae and heating same, said device comprising: a lamp that can activate photosynthesis, a frame (4) supporting the lamp, and a motorised movement means mounted on the frame, characterised in that the device includes a guiding means, a means for controlling the motorised movement means, and a data-processing means intended to analyse at least a first information item relating to the position of the guiding means and configured to activate the control means of the motorised movement means according to said position information item.
