The present invention is a locker retrofit assembly which may be adapted for replacing the door and frame components of an existing locker system. A counting measure may be defined in the hierarchical database such that the counting measure is associated with members of a first category of data to be stored in the hierarchical database. The light emission command signal and the delay signal are logically added to a command signal from an external source at a threshold signal generation unit so that a threshold ON signal is output. The contact block may be coupled to a printed wiring board in an automated, reflow solder process utilizing automated pick and place equipment. For recombination, narrowband optical signals are coupled into the body at different locations on the outer wall and propagated in substantially helical paths that converge at an end surface.