A recent Cochrane review found very little high quality evidence in either direction:<p><a href="http:&#x2F;&#x2F;www.cochrane.org&#x2F;CD011269&#x2F;DEPRESSN_light-therapy-prevention-winter-depression" rel="nofollow">http:&#x2F;&#x2F;www.cochrane.org&#x2F;CD011269&#x2F;DEPRESSN_light-therapy-prev...</a><p>It&#x27;s not clear to me why light therapy is considered as a well-researched treatment.