Inclusion Criteria:  [1] Outpatients 19 to 65 years of age; [2] DSM-5 criteria for major depressive disorder (MDD) past or recurrent episode as determined by the Mini International Neuropsychiatric Interview; [3] taking an antidepressant for no more than six months; [4] participant desire to discontinue antidepressant treatment because of adverse effects or other reasons; [5] total score ≤10 on the clinician-rated Montgomery-Asberg Depression Rating Scale [MADRS]; [6] Willing and able to complete self-report and online assessments including sufficient fluency in English.  Exclusion Criteria:  [1] Any psychiatric diagnosis other than MDD that is considered the primary diagnosis, including Bipolar I or Bipolar-II (lifetime); [2] MDD with psychotic features (lifetime); [3] significant personality disorder diagnosis [e.g., borderline, antisocial]; [4] High suicidal risk, defined by clinician judgment; [5] History of drug or alcohol abuse, with a severity of at least moderate or severe within 6 months before screening; [6] Significant neurological disorders, head trauma, or other unstable medical conditions; [7] regular use of psychotropic medication other than an antidepressant or benzodiazepines (e.g., antipsychotics, mood stabilizers); [8] history of severe withdrawal effects with antidepressant discontinuation; [9] retinal disease or other eye condition preventing use of bright light therapy; [10] use of photosensitizing medication within 1 week of baseline visit.