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Modern lights will often produce strong coloured lights which are way off the kelvin (K) line in spectrum– this line is called the cie planck line (shown as black line above). Light on this line tends to be balanced spectrum with a slight bias to blue (high K) and red (low K)
Once you are above 10k the kelvin quickly shifts up and toward infinity with the addition of only tiny amounts of blue light. This will create a point so far off the line that we have to label it ‘not a kelvin’. Also plant tubes often high in green can pull the spectra point away from the line.
Actinic lighting does not have a kelvin; it is a blue coloured (wavelength) lamp and a single tube can add significant amounts of blue which will also give ‘not a kelvin. Seneye looks at the combined light hitting an area i.e. what the plant or coral will receive. The advent of led lights (especially high blue) has made this deviation away from a kelvin much more common.
Hope this helps in your understanding and also helps you understand why we included a 3 point spectra meter on the software to help people see where there light is peaking even when a Kelvin is not present.
We do have some info on the main web site that is worth a quick read