Right, makes sense. Sounds like that was the bit of context I was missing and also taking for granted: available natural sunlight. And I should have thought of

Right, makes sense. Sounds like that was the bit of context I was missing and also taking for granted: available natural sunlight. And I should have thought of that, honestly: I work next to a window with lots of light during summer, but in winter I use a high-power lamp to fake sunlight. (plus I happen to treat blue light filters as an "default with opt-out possibility" kind of setting in general)