Here's some good info on light boxes: Seasonal affective disorder treatment: Choosing a light box - Mayo Clinic

I don't have a light box, but I just want to let you know that some light boxes are intended for dermatology, etc. rather than depression. The "lux" doesn't really matter if you get a dermatological light box by mistake because dermatological light boxes don't work on depression. IIRC, the type of light is what really matters -- e.g., how much UV, etc..

I had thought about a light box before, which is the only reason I know these things. But yeah...