IntroductionCyanobacteria appeared in the anoxic Archean Earth. evolving for the first time oxygenic photosynthesis and deeply changing the atmosphere by introducing oxygen. Starting possibly from UV-protected environments. characterized by low visible and far-red enriched light spectra. https://www.roneverhart.com/Turbosound-TS-18SW700-8A-18-Low-Frequency-Loudspeaker-p31480/