The problem of modifying the intensity spectrum of a given source in order to
obtain a required intensity curve is discussed. The special problem of the correction of a tungsten lamp of color temperature 2856 K in order to match AMO solar
spectrum is considered, taking advantage of a new method for the layout of glasses
and multilayer combined filters. The results presented here show that a structure
composed by two glasses and 13 layers allow to solve it with a limited loss in intensity.