In message , Dave Plowman
writes
The colour temperature of daylight doesn't necessarily change with
brightness - that daylight might well find its way into a room via a white
reflective area - say a wall.

Maybe I've misunderstood what you're trying to say here but, but the
daylight reflected off a *white* wall will have the same colour
temperature as the actual daylight.

--
bof at bof dot me dot uk