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Explanation: after the not very constructive input from 2 participants (who did not come up with anything that would appear better than my suggestions on top)
I put on my thinking hat once again.
Is this anything pertaining to the printing business?
(Of course, the Kammer and Raum parts can be switched).
That is a tough job, grading the answers here.
In fact I should have given Klaus points, too, but unfortunately that's not possible.
As Klaus pointed out a viewing booth has 5000 K and this is in fact related to Tageslicht, I can well choose one of the above options. 4 KudoZ points were awarded for this answer