DETAILED DESCRIPTION I claim: 1. An energy-spreading installation for controlling, in the entire spectral range, radiant energy amounts irradiating a room having a plurality of confining walls comprising a bottom floor, a side wall zone and a ceiling zone, which room the energy amounts are to fill, said radiant energies stemming from at least one radiation source located outside or inside said room, comprising surface means adapted for a predetermined spreading, in said room, of radiant energy in order to attain a state ranging from diffusion to total reflection, in the entire spectral range, said means being mountable on a confining wall of the room; wherein said surface means comprise those of a double-glazed window, said window comprising a plurality of reflection elements arranged one above the other and located between the two glass panes of the window; and wherein said reflection elements comprise shell-shaped reflectors and support elements for said reflection, said support elements being specular on one side; and said support elements being of transparent plastics material and their side holding the reflectors comprising a specular surface with diffusing structures. 2. An energy-spreading installation for controlling, in the entire spectral range, radiant energy amounts irradiating a room having a plurality of confining walls comprising a bottom floor, a side wall zone and a ceiling zone, which room the energy amounts are to fill, said radiant energies stemming from at least one radiation source located outside or inside said room, comprising surface means adapted for a predetermined spreading, in said room, of radiant energy in order to attain a state ranging from diffusion to total reflection, in the entire spectral range, said means being mountable on a confining wall of the room; wherein said surface means comprise those of a double-glazed window, said window comprising a plurality of reflection elements arranged one above the other and located between the two glass planes of the window; and wherein said reflection elements comprise shell-shaped reflectors and support elements for said reflectors, said support elements being specular on one side; and wherein said support elements are provided with an internal duct and are designed as combined reflecting and absorbing elements and are adapted for being cooled by a coolant flowing through said duct
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