We have grown silver prisms and pentagonal bipyramids, induced by plasmon excitation on a colloidal
solution under the irradiation of light emitting diodes of different colors. Two methods of synthesis of
the seeds were tested and their growth evolution recorded, in order to analyze the effect of the chemical
synthesis and the color of the irradiation on the morphology and size of the final product. We show that
the conversion rate into anisotropic nanoparticles is determined by the chemical environment and the
shift of the irradiation wavelength with respect to the plasmon resonance of the seeds. The conversion
rate defines the final morphology of the nanoparticles, whereas the size of the nanoparticles is univocally
determined by the wavelength of irradiation, irrespective of the method to prepare the seed solution.
