I have a light box, which helps somewhat, I think. Using it leads me to think my own particular winter funk is part light and part cold. I don't do well in extreme heat or moderate cold unless I'm so busy I forget the cold. With me, the light helps with mood while I'm under the light. The effect wears off within an hour or so, so maybe I need more than an hour a day or a portable light visor or maybe it just isn't my solution. More consistency might help too. :-)

Mine is a SunSation by Sunbox.