The system includes {HEAD ~ a lamp}, a ballast, a first interface, a storage unit, and {TAIL ~ a processing unit} 
The system includes { HEAD ~ a lamp } , a ballast , a first interface , a storage unit , and { TAIL ~ a processing unit }
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL