A matte surface of a display screen is converted to an optically flat surface, for example, via an epoxy resin coating or the like which has a refractive index equal to that of the matte surface. The system provides for cleaning and disinfecting the bottom of the feet or footwear. The detector samples at least one monitor point associated with the discharge lamp lighting device to obtain at least one detection voltage. The code segment could perform a one-way hashing algorithm of a portion of memory indicated in the parameters.