{TAIL ~ The controller shifts} available {HEAD ~ power} between the first lighting source and the second lighting source 
{ TAIL ~ The controller shifts } available { HEAD ~ power } between the first lighting source and the second lighting source
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH