David Chapman has a great writeup on this:

https://meaningness.com/sad-light-lumens

His other writing is great too, but much more philosophical which may or may not be your cup of tea.

> That light reflects smoothly off the entirety of the white ceilings. A great combination of very high intensity lighting, that is also gentle, diffuse and calming.

The description from GP, and the photos in the article you linked, seem like polar opposites of each other.