The light-box (1) has a flexible inner ply (20) arranged at interior of tubular shape (11) between a set of light sources (14) and an outer ply (18) and permitting sealed insulation of the outer ply from the light sources. An external tie-off rail (17) forms a peripheral frame arranged at an outer side of the tubular shape, where the external tie-off rail comprises engaging units for receiving the outer ply and a flexible ply (7) to tightly maintain the outer ply and the flexible ply. The outer ply is constituted of a translucent fabric produced from polymeric materials.
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