Seasonal Affective Disorder Treatment segmentation by Type disaggregates the market into Light Therapy, Pharmacotherapy, Psychotherapy, and Others. Light Therapy dominates value share because clinical guidelines continue to rank 10,000-lux devices as first-line for moderate presentations, while falling unit prices expand household penetration. Pharmacotherapy—centred on SSRI and agomelatine scripts—derives revenue from prescription refill cycles, so manufacturer risk is modestly insulated from seasonality. Psychotherapy, chiefly cognitive-behavioural adaptations, is growing fastest as payors accept digital CBT codes; session-based pricing caps absolute dollar size but yields high per-patient contribution. The residual Others segment, including dawn simulators, vitamin D supplementation and trans-cranial stimulation, remains fragmented yet collectively adds low-double-digit millions, reflecting patient willingness to trial adjunctive options. Together these four categories provide the market taxonomy required to map manufacturer pipelines, reimbursement policy and demand forecasting for Seasonal Affective Disorder Treatment.