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The use of light for its antidepressant action dates back to the beginnings of civilization (1)
BLT is classically delivered through a light box that is equipped with fluorescent tubes and a reflector or diffusing screen:
SAD corresponds to the seasonal pattern of recurrent major depressive episodes occurring during the same time of the year, usually in autumn or winter with spontaneous remission in the spring or summer
There is evidence that BLT is an effective depression treatment not only to be used in SAD but also in non-seasonal depression and in BD (bipolar disorder) (1).
Results of a systematic review and meta-analysis revealed that BLT was an effective adjunctive treatment for nonseasonal depressive disorders (2):
Reference:
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