This meta-analysis examines the efficacy of light therapy (LT) compared to antidepressant drugs (AD) and their combination (LT + AD) in treating major depressive episodes.
Bright Light Therapy Lamp, a meta-analysis in 397 participants (Sleep Med Rev 2019, PMID 31600678) — heterogeneity between studies was low (I = 0%, 18.41%, and 39.23%), and no publication biases were found. No significant difference was observed between light therapy alone and antidepressant drugs alone.
Source: Sleep Med Rev 2019, PMID 31600678 ↗ · Research map · How Magellan grades evidence · evidence confidence: high
Sleep Med Rev · 2019 · PMID 31600678 · DOI 10.1016/j.smrv.2019.101213
Combining light therapy with antidepressants is more effective than antidepressants alone for major depressive episodes, and light therapy alone is comparable to antidepressants alone.
The question
This meta-analysis examines the efficacy of light therapy (LT) compared to antidepressant drugs (AD) and their combination (LT + AD) in treating major depressive episodes.
What they tested
The study aims to determine if light therapy, alone or in combination with antidepressants, is as effective or more effective than antidepressant drugs alone for major depressive episodes.
How they did it
A systematic review and weighted random effect meta-analysis was conducted on randomized controlled trials directly comparing light therapy and antidepressant drugs, as well as their combination. Seven independent populations, totaling 397 participants with moderate to severe major depressive episodes, were included. The median intervention duration was 5 weeks.
What they found
The superiority of LT + Placebo compared to AD + Placebo was not statistically significant (SMD = 0.19; p = 0.17). However, the combination of LT + AD was superior to AD + Placebo (SMD = 0.56; p < 0.001). This superiority was also observed in patients with non-seasonal depression (SMD = 0.55; p = 0.005). Heterogeneity between studies was low (I = 0%, 18.41%, and 39.23%), and no publication biases were found.
What it means
No significant difference was observed between light therapy alone and antidepressant drugs alone. The combination of light therapy and antidepressant drugs showed clear superiority. Therefore, both light therapy monotherapy and the combination therapy may be considered first-line treatments for seasonal and non-seasonal depression.
Limitations
The abstract does not explicitly state any limitations of the study.
Where the published abstract does not list limitations, we say so rather than inventing them. Read the full paper on PubMed before drawing conclusions.
The paper at a glance
| Title | Efficacy of light therapy versus antidepressant drugs in major depressive episodes: a meta-analysis |
|---|---|
| Journal | Sleep Med Rev |
| Year | 2019 |
| PMID | 31600678 ↗ |
| DOI | 10.1016/j.smrv.2019.101213 ↗ |
| Topic | Sleep, circadian rhythm & stress |
Read the source: PubMed record (authors, abstract, full citation) ↗ · Publisher via doi.org ↗
Where Magellan uses this paper
This citation sits behind the evidence grade on the pages below. Grades are set from the research and are independent of affiliate commissions.
Bright Light Therapy Lamp
Randomized controlled trials and meta-analyses indicate that bright light therapy reduces depressive symptoms in seasonal affective disorder and, as an adjunct, in nonseasonal depression — a 2024 JAMA Psychiatry meta-analysis found roughly doubled remission (40.7% vs 23.5%) and response (60.4% vs 38.6%) rates versus…
A bright light therapy lamp (light box) is a device that emits high-intensity, broad-spectrum white…
Research describes the compound or intervention studied. It is not a claim about any specific product.
Cite this page
These citations point at this summary. To cite the original paper with its full author list, use the PubMed record or doi.org.
Magellan Longevity. (2026). This meta-analysis examines the efficacy of light therapy (LT) compared to antidepressant drugs (AD) and their combination (LT + AD) in treating major depressive episodes. [Plain-English summary of Sleep Med Rev 2019, PMID 31600678, DOI 10.1016/j.smrv.2019.101213]. Magellan Longevity. https://magellanlongevity.com/study/d31600678.html@misc{magellan_d31600678,
title = {This meta-analysis examines the efficacy of light therapy (LT) compared to antidepressant drugs (AD) and their combination (LT + AD) in treating major depressive episodes.},
author = {{Magellan Longevity}},
year = {2026},
howpublished = {\url{https://magellanlongevity.com/study/d31600678.html}},
note = {Plain-English summary of PubMed PMID 31600678; DOI 10.1016/j.smrv.2019.101213; Sleep Med Rev 2019. Reviewed by Gabriel Radu, DO},
urldate = {2026-08-11}
}https://magellanlongevity.com/study/d31600678.htmlRelated studies in the Magellan library
- Is bright light therapy (BLT) effective in treating seasonal affective disorder (SAD) in adults?Psychother Psychosom · 2019 · PMID 31574513
- Blue-Light Therapy for Seasonal and Non-Seasonal DepressionCan J Psychiatry · 2022 · PMID 35522196
- Systematic review of light exposure impact on human circadian rhythmChronobiology International · 2019 · PMID 30311830
- What is the role of hair cortisol as a biomarker for chronic stress in cardiovascular disease…Curr Cardiol Rep · 2019 · PMID 31471749
- Pilot Study of Tart Cherry Juice for the Treatment of Insomnia and Investigation of MechanismsAm J Ther · 2018 · PMID 28901958
- Benefits and Harms of Cranial Electrical Stimulation for Pain, Depression, Anxiety, and InsomniaAnn Intern Med · 2018 · PMID 29435567
All 23 Magellan summaries on sleep, circadian rhythm & stress →
Prefer the interactive version? Open this summary in the Magellan app → · Browse all 314 study summaries →