In the last decade it was shown that the advantages of microreactor can be transposed with success to industrial scale(1).At the same time LED has become an important energy saving light source in our everyday life.By combining these technologies we are ready to fulfil G.L.Ciamicians demand of a better use of light(2).Corning has developed a scalable photo flow reactor with an optimized LED lighting(3).The presented experimental data will demonstrate the various benefits of performing photochemistry continuously,especially the simplicity of scaling up with enormous energy savings.