Participants will be randomized to receive BWL (n=61) or DRL (n=61) light therapy boxes (Litebook® Elite; Litebook® Inc., Medicine Hat, CA) to use at home for 60 minutes each morning for 8 weeks. If participants are currently receiving treatment (e.g. antidepressant therapy), participants will continue their usual treatment while in the study. Participants will be told that the effects of a particular light therapy protocol on mood and functioning is being investigated. Participants will be made aware that there is a treatment condition of interest and a comparison condition and that participants will be randomly assigned to one or the other group. Participants will not be told that different colors of light are being used or that BWL is the treatment of interest. The Litebooks® will look identical except for the color of the light. Weekly telephone calls will encourage compliance, and compliance meters will record when the Litebooks® are turned on or off. A blood sample will also be collected from each patient to assess for biomarkers.