We all know that for our brew, direct sunlight is really, really bad. I'd say that indirect sunlight that is still relatively bright (for example next to a window, but not in a place where it will get direct sun), is also not that good.
But apart from that, is there much difference between normal room levels of light and complete darkness? For example just sitting in the corner of a room, maybe under a desk, not directly beneath the window but also not in complete darkness. I'd say it would be receiving a modest amount of light on the visible spectrum, but almost zero levels of UV, and it would make little difference to put it in complete darkness.
Correct me if I'm wrong.