@herf
Thanks, I see that now but I didn't notice it before you mentioned it.
What does the Disable for a specified program do? Does it set the display to 6500K and is that what the Return to Full Brightness does?
Do all these options do the same thing? Or can the colour temperature be at 1900K when "Return to Full Brightness" is enabled? It's not very clear what the keyboard shortcuts do. I would think that if the colour temperature was set to 1900K then Alt+PgDn would only reduce the brightness from 1900K and go up to 1900K maximum. That would be different to Full Brightness would it not?