Industrial ecology conceptualises industry as a man-made ecosystem that operates in a similar way to natural ecosystems, where the waste or by product of one process is used as an input into another process. Industrial ecology interacts with natural ecosystems and attempts to move from a linear to cyclical or closed loop system.Among ecological factors, light has a major influence on the life of land plants. Within natural plant consortia, variations in light intensity (irradiance) and quality (wavelength) are two direct consequences of plant stratification, experienced not only by plant individuals growing at different layers, but even by leaves of the same tree located in different positions of the crown. Two conditions can easily be described, i.e. the sun condition and the shade condition