Also increase your vit. D intake. Low Vit D is associated with quite a few medical issues in women, depression, obesity, breast cancer to name a few. My doc has me on 4000iu daily. Plus you need 15minutes in the sun WITHOUT sunscreen per day if you can. (it's got to do with how your body converts Vit D to a useable form. Have as much exposed skin as you can stand. When it's really cold I try for 5min at a time so I don't freeze! LOL) That and the full spectrum light have really helped me. I was able to come off the antidepressant that I would take from October until May!
Oh with the light, 15minutes is plenty of time. I had one on my desk at work to light my dark little corner. Don't use it in the evening or after about 3pm. You don't want to throw off your natural sleep rhythms.