We conceive the Sun as bright-white source of radiation and only the rainbow, is an everyday indication of the colors its light contains. A quantitative description of the colors emitted by a body held at a given temperature  was first developed by Max Planck in the early days of the previous century, relating the intensity of each color (wavelength) to the temperature of the body – provided the typical dimension of the body is significantly larger than the radiation’s wavelength.  Since inherently Planck’s formula is independent of the characteristics of the material, it is conceived to describe the upper limit to what a body can emit at a given temperature.  In the framework of an article published in PRA we have demonstrated that if the characteristic length of the emitting body is of the order of the wavelength, the intensity it emits, in a narrow range of wavelengths, may exceed significantly the prediction of Planck’s theory.  Such an enhancement may be designed to overlap the spectral region where a photo-voltaic cell performs the best, improving in the process its theoretical efficiency dramatically.