Methods, systems, and computer program products for clustering and communicating between Internet protocol multimedia subsystem entities and for supporting database access in an IMS network environment. The sizes of the two symbols relative to one another is changed such that the relative size of the symbol marking the direction which is to be taken after the turn-off point increases as the turn-off point is approached. A current limiting diode module, comprising at least one CLD is coupled in series to an output of the full wave rectifier and a light emitting diode module comprising a plurality of LEDs is coupled in series between an output of the CLD module and the full wave rectifier.