Planckian locus
2.To determine the appropriate length of the isotemperature lines on thePlanckian locus in the CIE 1960 UCS Diagram, 7 lights from 0--360μrd inequal intervals of 60 μrd in the Planckian locus were used as standards,with each standard light a set of 10--12 lights on each corresponding iso-temperature line was used as test lights.

