Disclosed herein is a method of treating mammalian, for example, human, skin afflicted with a sebaceous follicle disorder, for example, acne. A plurality of redundant ringing voltage generators sourcing internally andor externally ringing voltages are individually and selectively connectable to the multiple ringing bus segments. Thus, it is possible to make an accurate color gamut boundary descriptor. The electromagnetic wave beam generator may, be configured to provide a wave beam having a polarization substantially similar to its initial polarization. The shield includes folds, perforations, pre-scoring, grooves, and the like defining sections that can be easily detached to create windows. The present invention is a sustainable option to illuminate the storm door and exterior entrance door of a residence.