Inclusion criteria | Women |
 | 18–45 years of age |
12–18 weeks pregnant | |
DSM-V diagnosis of depressive disorder (as assessed by the Structured Clinical Interview for DSM disorders) | |
Exclusion criteria | Insufficient proficiency in Dutch or English |
 | Multiple pregnancy |
The use of antidepressants shorter than 2Â months | |
Bipolar I or II disorder | |
Any psychotic episode | |
Substance abuse | |
Primary anxiety disorder | |
Recent history of suicide attempt | |
Shift-work | |
Somatic and/or obstetric conditions that override study participation | |
Previous treatment with BLT | |
Eye condition (macular degeneration, eye diseases, recent eye surgery) |