Mackert 1990.

Methods	Allocation: randomized. Blindning: double blind, 'rater blind'. Duration: 7 days.
Participants	Diagnosis: Major depressive disorder. RDC, ICD‐9. Exclusion criteria: seasonal depression, ophthalmological or oculomotor disorder, acute suicidality, IQ lower than 90. N = 42. Age: mean 54.2 years. Sex: F 34, M 8. Setting: inpatients.
Interventions	1. Bright white light (2500 lux 7‐9 AM for 2 hours). N = 22. 2. Dim red light (50 lux 7‐9 AM for 2 hours). N = 20. Device: light box.
Outcomes	Mental state (HDRS, D‐S, D‐S', VAS, AMDP). Adverse effects (C‐ L). Patient expectation (subjective initial response). Physiological monitoring (ECG, lab). Global improvement (CGI).
Notes	Light only. No pharmacotherapy.
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment?	Unclear risk	B ‐ Unclear