zlacker

>>ivank+(OP)
A recent Cochrane review found very little high quality evidence in either direction:

http://www.cochrane.org/CD011269/DEPRESSN_light-therapy-prev...

It's not clear to me why light therapy is considered as a well-researched treatment.

>>sambe+Ad1
I'd put a black crow's feather behind my ear if I thought it would help me get through winter.

In other words, placebo effect is still an effect. The treatment being chemically vs. psychologicaly responsible for that isn't a concern for the subject, only the researcher.