Bright Light Therapy in Psychiatric Disorders: Mechanisms, Clinical Procedures and Evidence

Bright light therapy (BLT) is a evidence-based intervention that regulates mood by influencing circadian rhythms through light-sensitive retinal pathways to the suprachiasmatic nucleus. Strong clinical evidence supports BLT for seasonal affective disorder and major depressive disorder, with emerging benefits for bipolar disorder and insomnia, demonstrating excellent tolerability.