Abstract: A light box with at least three base profiles which in the assembled state form a closed base frame onto which a first tensible plane material to be illuminated can be fitted such that it forms the front side of the base frame, at least one illuminant which is disposed within the base frame in order to illuminate the light box, at least one power supply, in particular an electrical series connection unit in order to supply the illuminant with current, at least one supporting wall disposed on the rear side of the base frame which has at least one attachment for releasably fixing the illuminant and/or the electrical series connection unit within the base frame, the supporting wall being formed by a second tensible plane material which can be attached to the base frame such that it forms the rear side of the light box.