NOVELTY - The arrangement (1) for three-dimensional distribution of light (2) in a liquid medium (3) such as algae suspension and/or for the production of biomass, comprises light-conducting hollow fibers (4), an installation for the introduction of carbon dioxide, flue gas, sewer gas, manure gas or air into the medium for the formation of blowholes, and a collector mirror for the admission of sunlight, which is introduced into the medium. The light is distributed in different space regions within the medium, which is photoactive and/or biologically active and contains algae.    USE - Arrangement for three-dimensional distribution of light in a liquid medium and/or for the production of biomass (claimed) and/or for the transformation of carbon dioxide in biomass.    ADVANTAGE - The arrangement is simply constructed, and ensures simple and economical distribution of light in a liquid medium and/or production of biomass with high efficiency and energy-saving process flow in effective manner.    DETAILED DESCRIPTION - The arrangement (1) for three-dimensional distribution of light (2) in a liquid medium (3) such as algae suspension and/or for the production of biomass, comprises light-conducting hollow fibers (4), an installation for the introduction of carbon dioxide, flue gas, sewer gas, manure gas or air into the medium for the formation of blowholes, and a collector mirror for the admission of sunlight, which is introduced into the medium. The light is distributed in different space regions within the medium, which is photoactive and/or biologically active and contains algae. The fibers are held over lattice-or bar-like holders in different levels or depths within the medium and vertically run in the medium. The fibers are made from glass or plastic. A bundle of threads branches itself in a single bundle and/or in single fiber that ends in different and/or same depths lying in a plain, in the medium. The fibers and/or the bundles are moved in end regions by a flow of the medium. The fibers have an inner diameter of 10 mu m. The gases are introducible, distributable and/or releasable in bubble-shaped manner. The light is distributable through blowholes into the medium. The gases and the light are introducible into the medium by the hollow fibers. The blowholes form a resonance region for the light in each case. The blowholes have a size of 2-5 mu m. The gases are introducible over a base or a sieve and/or in a depth of 5-10 m and/or with a pressure of 50-800 kPa, into the medium. The light is supplyable over a common fiber bundles.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic representation of an arrangement for three-dimensional distribution of light in a liquid medium and/or for the production of biomass.    Arrangement (1)    Light (2)    Medium (3)    Fibers (4)    Bundle. (6)