The three DRV (361 and 362 and 363) are connected in parallel between them. THE IPM 30 can be connected to PS 10 in one end and in the other end can be connected with one of the plurality of LLS (401 or 402 or 403) and the IPM 30 communicates with the MCC 38. Only one of DRV 36 respective (361 or 362 or 363) is functional at one time, and only one of LLS 40 respective (401 or 402 or 403) is functional at one time. When either the DRV 361 or LED lighting source 401, or both, become non-functional or defective, the next spare DRV, DRV 362 or DRV 363 will replace the initially selected DRV 361, respective the next spare LED lighting source, LED lighting source 402 or LED lighting source 403 will replace the initially selected LLS 401, or both of them. The MCC 38 measures the Vin and Vout, and communicates with the IS 35, respective OS 37, and the LS 48. The MCC 38 determines if functional, in terms of DRV (361,362,363) and/or LED lighting source (401,402,403). When a faulty element DRV (361,362,363) or LED lighting source (401,402,403)) is detected, the MCC 38 commands the next spare DRV to connect to the PS 10 via a respective IS 35, the MCC 38 commands the next spare LED lighting source to connect to the DRV (361 or 362 or 363) via its respective OS 37.