The present application relates to an energy saving system, and particularly to a method and apparatus for saving {HEAD ~ energy} used by {TAIL ~ street or area lights} 
used by
The present application relates to an energy saving system , and particularly to a method and apparatus for saving { HEAD ~ energy } used by { TAIL ~ street or area lights }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL