In this revision, the moon light is again at 40%, but I have added 5 point lights, each at only 2% intensity.

The balance of moonlight through the window is decreased - why?

The moon doesn't change brightness. Why am I successful by changing it here?

Because our mental "camera" is at a different exposure!

I added other lights - interior lights. So there is plenty of light in every corner. The camera is set for a faster shutter speed. Thus the moonlight is less bright than before.

Now - how do you "buy" a set like this unless you also buy the room with it?

There is no single correct moonlight. You have to take into account camera exposure, which means you have to also consider other interior lights, which means you must also consider the shape of the room, and how would such a room be lit?

If lit from ceiling lights like an office, it is very different than lit from table and floor lamps like a home.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)