With the emergence of LEDs, the conventional incandescent or fluorescent lighting solutions tends to be replaced by LED lighting systems. Historically, the lighting system was invented before radio communications, therefore its infrastructure is more widespread and simpler. One property of the conventional lighting sources is that the optical radiation emitted by them cannot be switched on and off fast. In the latest trends in high-speed communication, LED lighting solutions are used to transfer data. This field is known as Visible Light Communications (VLC). In previous work, the authors investigated the available bandwidth of four power LEDs<sup>1</sup> that could be used for VLC systems. A typical low pass filter cutoff frequency identification procedure was used. For a complete characterization, the authors propose to determine the available bandwidth by investigating the switch-on time. The paper investigates the response time of power LEDs by studying four different LEDs: green, red, infrared and white. The LED driver circuit was especially designed for this application because it required very fast switch-on time.
The management of the Independent Power Grids is the global body/structure with flexible technological support for Command-Control-Communications and Informatized Management having the responsibility for providing the conditions and information (the informational flux of decision) for the decision-maker aiming at predictable and harmonic administration of the situations (crises) and for generating the harmonic situations (results).