{HEAD ~ The measurement} of {TAIL ~ the intensity} of the emission light during these intervals is exclusively performed during the switch on phases of the light, source  
of
{ HEAD ~ The measurement } of { TAIL ~ the intensity } of the emission light during these intervals is exclusively performed during the switch on phases of the light , source
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH