It was noted earlier that a single channel sensor cannot discriminate {TAIL ~ the exact color} of {HEAD ~ ambient light}, only its level 
It was noted earlier that a single channel sensor can not discriminate { TAIL ~ the exact color } of { HEAD ~ ambient light } , only its level
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH