My personal psychology: I've been working in cube farms for so long, that the constant fluorescent light level is a cue that means "you're in work mode." I don't think I would like only natural light at work. For example, a dark overcast day would make me sleepy and lazy.

Conversely, at home it's natural, varying light all the time, until night fall. It's my cue for "you're at home and can pursue whatever interests you. Or take a nap"