Abstract: The invention relates to a module (1) for generating light or energy, comprising at least one light or energy generator including at least one semiconductor cell (2), the area of which is greater than 0.01 m2, said cell being placed in a sealed enclosure maintained at a pressure below atmospheric pressure, said enclosure having a glass front side (3), a metal or metal alloy rear side (4) optionally coated on one or other of its faces, a peripheral sealing gasket (5), and electrical connectors (6) that are not fastened to said cells (2) or to said front side (3) and rear side (4), said rear side (4) being electrically isolated from said generators, characterized in that said rear side (4) has a metal or metal alloy thickness of less than 1 mm. The invention relates more particularly to photovoltaic modules and to LED or OLED illumination modules.