 Subjects will begin treatment when post-treatment SIGH-SAD depression score 20. Dr. Anderson or Dr. Glod will meet with each subject to provide the light device and instruction for its outpatient use as detailed below. The subject will be asked to sign a written agreement for return of the light device. Subjects will use the light device and return weekly for symptom ratings; each will be seen by Dr. Anderson or Dr. Glod as well. At the conclusion of the 3-wk trial, Dr. Anderson or Dr. Glod will meet with the subject to discuss their response to light treatment and the indications for continuing light treatment through the end of that winter. Subjects will be offered the opportunity to keep the same device or try the other device until the end of the fallwinter season and will be followed monthly if they choose to do so. Alternative treatment modalities also will be discussed and referrals for follow-up care provided as indicated. All forms of SAD treatment will cease by June 1. 