Illumination device, which comprises: - a support structure; - multiple illumination modules mounted on said support structure and each comprising a corresponding group of light sources; - a liquid cooling plant, which is operatively associated with said light sources in order to dissipate heat generated by said light sources during the operation thereof, and comprises: - a hydraulic circuit provided with pumping means adapted to circulate a coolant fluid in said hydraulic circuit; - a first heat exchanger, which is placed to intercept said hydraulic circuit in order to be traversed by said coolant fluid and is thermally connected to said light sources in order to transmit at least part of the heat generated by said light sources to said coolant fluid; - a second heat exchanger placed to intercept said hydraulic circuit in order to be traversed by said coolant fluid and adapted to transfer, to the outside environment, at least part of the heat that was absorbed by said coolant fluid in said first heat exchanger; wherein said first heat exchanger comprises: - a manifold provided with a passage channel which comprises an inlet branch provided with a delivery opening connected to said hydraulic circuit in order to make said coolant fluid enter into said passage channel, and an outlet branch provided with an expulsion opening connected to said hydraulic circuit in order to make said coolant fluid exit from said passage channel; characterised in that said first heat exchanger further comprises - at least one heat transmission block made of thermally conductive material; wherein said at least one heat transmission block carries said illumination modules mounted thereon and is provided with multiple cooling tracks which are hydraulically connected, parallel to each other, to the inlet branch and to the outlet branch of the passage channel of said manifold and are each arranged at a respective said illumination module, in order to transfer the heat generated by the light sources of said illumination module to the coolant fluid which traverses said cooling track. - a support structure; - multiple illumination modules mounted on said support structure and each comprising a corresponding group of light sources; - a liquid cooling plant, which is operatively associated with said light sources in order to dissipate heat generated by said light sources during the operation thereof, and comprises: - a hydraulic circuit provided with pumping means adapted to circulate a coolant fluid in said hydraulic circuit; - a first heat exchanger, which is placed to intercept said hydraulic circuit in order to be traversed by said coolant fluid and is thermally connected to said light sources in order to transmit at least part of the heat generated by said light sources to said coolant fluid; - a second heat exchanger placed to intercept said hydraulic circuit in order to be traversed by said coolant fluid and adapted to transfer, to the outside environment, at least part of the heat that was absorbed by said coolant fluid in said first heat exchanger; wherein - a hydraulic circuit provided with pumping means adapted to circulate a coolant fluid in said hydraulic circuit; - a first heat exchanger, which is placed to intercept said hydraulic circuit in order to be traversed by said coolant fluid and is thermally connected to said light sources in order to transmit at least part of the heat generated by said light sources to said coolant fluid; - a second heat exchanger placed to intercept said hydraulic circuit in order to be traversed by said coolant fluid and adapted to transfer, to the outside environment, at least part of the heat that was absorbed by said coolant fluid in said first heat exchanger; wherein - a manifold provided with a passage channel which comprises an inlet branch provided with a delivery opening connected to said hydraulic circuit in order to make said coolant fluid enter into said passage channel, and an outlet branch provided with an expulsion opening connected to said hydraulic circuit in order to make said coolant fluid exit from said passage channel; characterised in that said first heat exchanger further comprises - at least one heat transmission block made of thermally conductive material; wherein said at least one heat transmission block carries said illumination modules mounted thereon and is provided with multiple cooling tracks which are hydraulically connected, parallel to each other, to the inlet branch and to the outlet branch of the passage channel of said manifold and are each arranged at a respective said illumination module, in order to transfer the heat generated by the light sources of said illumination module to the coolant fluid which traverses said cooling track.