I personally like extremes. My ideal scenario would be a dark room where I can get work done, and then every hour or so, I take a five-minute break outdoors in direct sunlight.
I spend most of the day in a fairly dark room, but make sure to get at least 20 minutes of sunlight on my bare skin and eyes every other day -- but it's not because I like extremes: it is because sunlight is good for me, but LED light bulbs are bad for me or at least they are if they are of typical brightness and they are on most of the day.
