FIG. 4 shows an embodiment of an light emitting diode (LED) lighting system 20 in the example topology 1, 2, 2, which means one power source 10, two drivers 362, 361, and two LED light sources 401, 402. The power source 10 sends power to the circuit system 20, first reaching input selector 35. The input selector 35 can either send the current through to the first driver 361 or the second driver 362, or to both in parallel. If the input selector 35 sends the current through the first driver 361, and that driver is faulty, then the input selector 35 sends the current through the second driver 362. A sensor can be included at the input selector 35 or just past each of the drivers 36 or at the microcontroller 38, in order to keep track of whether a driver(s) 36 is faulty and does not work properly. The microcontroller 38 is also connected to each of the segments in the circuit, in order to keep track of the current. For example, the microcontroller can be connected as shown in FIG. 4 to the output of the power source 10, the output of the drivers 36, as an output to each of the input selector 35 and output selector 37, and to the light sensor 48 which is connected to the LED light sources 401, 402. In FIG. 4, the light sensor 48 is shown as connected to only the second LED light source 402. However, in an embodiment, the same light sensor 48 or another light sensor can also be connected to the LED light source 401. Accordingly, throughout each of the different phases of the system, the microcontroller checks the connections. The microcontroller 38 can be a processor or even a special purpose or general computer. The microcontroller 38 can be connected to a variety of additional sources, including an internet/WiFi/Bluetooth? or other networked connection to a separate computer terminal, a server, or even a networked system 39. The microcontroller 38 can be connected to keyboard/key pad/display screen to allow direct access to the microcontroller by a user or administrator.
