Relativistic views of the plane electromagnetic wave in their engineeric sense

Starting from Lorentz relativistic relations and considering the plane electromagnetic wave in homogeneous isotropic environment, with two coordinate systems one of which moving with speed V, are obtained the Poynting Vector relations for the directions V=V_x, V_y, V_z, of the electromagnetic energy and forces; are also obtained simple relations of E, H, of Δ and ΔH; there are viewed the two equivalencies: that of media and that of sources; it is generated the dual form of Lorentz Lemma; are treated simple relations originating from the reciprocity theorem.