Bright light treatment started out as a way to relieve winter depression, but it has since been shown to be effective for seasonal and non-seasonal major depression. It could also benefit people with bipolar disorder, in which moods swing from depression to mania, note the authors of the report in the medical journal Bipolar Disorders.
To see what "dose" of bright light might be best, Dr. Dorothy Sit, of University of Pittsburgh Medical Center, Pennsylvania, and colleagues conducted a small study with nine women in the depression phase of bipolar disorder who were unresponsive to conventional treatments.
The women were given light boxes and used them for 15, 30, and 45 minutes daily, each for 2-week periods.
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