I see people come into my store and they ask about full spectrum bulbs. I have told a few it is not affective in treating depression but their are too many people trying the same thing.
Full-spectrum Controversy

But that sitting in front of a high intensity light-box is affective at treating S.A.D. It needs to be 2,500 to 10,000 lux though so you have to actually buy a light box which costs about 200 dollars. S.A.D. is a big deal here in Washington where we have 230 overcast days a year and the winter it seems like you can go a month or more without seeing the sun. It doesn’t actually rain as much as people think just always cloudy. Bright Light Therapy