| Summary: | This paper presents information about design of special light sources, which is intended for photosynthesis process research, especially for photoinhibition effect. Required properties were continuous spectral characteristic with respect to photosynthetically active wavelength area, possibility of luminous flux regulation and practically zero thermal effect to illuminated object. Owing to new high-performance LED this type of light source was selected. Design of light source consisting of high efficient white LED’s, as well as experimental results, are presented. The special light source was designed and constructed for the research activity on the lichen structure in the Antarctica. This research is made by the Institute of Experimental Biology, Masaryk University, Faculty of Science.
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