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J Affect Disord. 1990 May;19(1):15-21.

Effect of bright white light therapy on non-seasonal depressive disorder. Preliminary results.

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Department of Psychiatry, Free University of Berlin, Germany.


In this study, the effect of bright white light (2500 lux) and dim light (50 lux) were assessed in 30 patients with non-seasonal major depressive disorder randomly assigned to either procedure. Patients met RDC for major depressive disorder and ICD-9 criteria (296.1 and 296.3). During a 7-day period, the patients were exposed to bright white light (2500 lux) or dim light (50 lux) from 7.00 to 9.00 h daily. The severity of depression was assessed with observer scales (AMDP system, Hamilton depression scale, CGI) and through self-evaluation by self-rating scales (depression scale and list of complaints by von Zerssen). No difference was noted between bright light therapy and dim light, though a significant reduction of depressive symptomatology was observed for all patients during the study. These findings are discussed from a clinical point of view.

[Indexed for MEDLINE]

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