A medical lead is provided for use in a pulse stimulation system of the type which includes a pulse generator for producing electrical stimulation therapy. The insertion portion is to be inserted a hole of a base member having circuitry thereon. The color density data of the cartridge test patch is then mapped to the color density data of the reference cartridge test patch to generate mapped color density data, such as a look-up table that provides a dot activation for the cartridge that generates the same color density for a known dot activation for the reference cartridge.