Vallo Kallaste wrote: > reproducibility? I mean that when near lab-grade instrument is able to give > reproducibility in ± 20 K range then my assumptions about consumer grade > instruments are plainly wrong. Color temperature in degrees K is notoriously non-linear. So there is no proportionality between a change in degrees K and the visual effect. A more linear measure is Mired: <http://en.wikipedia.org/wiki/Mired> Graeme Gill.