Measuring of CCT

Moin moin,

I have here:
1. an used Minolta CA100 (not the plus), last calibration 2005
2. a freshly from Gossen calibrated Gossen Colormaster 3F
3. an integrating sphere 30 cm diameter, painted with BaS04 (ODP97)

and a bunch of LEDs (Samsung and Cree) with, more or less, relative
narrow bins...

The first trials with the CA100 and and Samsung leads to some (censored
words)...the CCT of the LED SLHNW531T0S0QRC5 is even visible not
homogenous over the angle of view... after some time...

Measuring of CCT