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