The processing unit transmits {HEAD ~ an illumination signal} to the ballast via {TAIL ~ the first interface}, such that the ballast controls the illumination of the lamp according to the first waveform 
via
The processing unit transmits { HEAD ~ an illumination signal } to the ballast via { TAIL ~ the first interface } , such that the ballast controls the illumination of the lamp according to the first waveform
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH