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Light box

I've begun therapy with a light box, for seasonal affective disorder. Right now I'm sitting at my computer with the light source aimed at my face. Outside, it's overcast, and compared to the light inside, I would have thought it was getting on for twilight, even though it's 1 pm. That's how dim it is outside compared to this light source.

It will be interesting to compare the light source to a sunny day, and particularly a sunny day in summer, to see whether the difference is due to the season and the cloudy skies, or whether what I have here is an unnaturally bright source of light.

I am a little concerned about exposure to UV rays, but the literature says that modern light boxes don't emit UV, just visible light.