Light at the end of the tunnel? new trial tests bright light for bipolar depression

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: 1. Aged 18-65 years. 2. Is capable to give informed consent. 3. Meeting the diagnostic criteria of bipolar depression (including both bipolar I and II disorders) by the Structured Clinical Interview for Diagnostic and Statistical Manual of Mental Disorders, 5th edition (DSM-V), Disorders (SCID-V). 4. a score 20 or above representing current moderate or severe episode of major depression and a score of at least 1 on items H1 or H2 on the Structured Interview Guide for the Hamilton Depression Rating Scale with Atypical Depression Supplement (SIGH-ADS), corresponding to at least moderate severity. 5. A score of 41 or less by the Morningness-Eveningness Questionnaire which represents eveningness. 6. On a stable dose of antimanic treatment for bipolar disorder for at least four weeks. Exclusion Criteria: 1. Major Depressive Disorder fulfilling the Seasonal Pattern Specifier of the DSM-V (Seasonal Affective Disorder). 2. A past history of rapid-cycling within the past twelve months or a Young Mania Rating Scale more than 12 at screening 3. A current or past history of schizophrenia, mental retardation, organic mental disorder; or current substance use disorder. 4. Presence of psychotic symptoms or substantial suicidal risk as judged by the clinician and/or screening instruments. 5. Presence of contraindications to bright light therapy: for example, history of light induced migraine/ epilepsy; current use of photosensitizing medications such as St. John's wart; presence of eye disease: e.g. retinal blindness, severe cataract, glaucoma, and photosensitive skin condition e.g. systemic lupus erythematosus 6. Significant medical condition/ hearing impairment/ speech deficit leading to incapability of completing clinical interview. 7. Regular shift-workers or trans-meridian flight in the past 3 months or during study 8. Enrolment in another clinical trial of an investigational medicinal product or device. 9. Receiving regular psychotherapy.