Quick Answer
Light therapy for bipolar depression showed promise in a randomized trial: adding midday bright white light to stable antimanic medication led to remission in 68% of participants versus 22% with dim placebo light. Earlier reports linked morning light to switches into mania, so light therapy in bipolar disorder should be supervised, timed carefully and used with mood-stabilizing treatment.
Understanding light Therapy for Bipolar Depression
Bright light therapy, sitting near a special light box for a set time each day, is well known for seasonal depression. For bipolar depression, the picture is more complicated. A randomized, double-blind, placebo-controlled trial led by Dorothy Sit and published in the American Journal of Psychiatry in 2018 tested midday bright light for adults with bipolar depression who were already taking stable antimanic medication. Participants used either 7,000-lux bright white light or 50-lux dim red placebo light around midday for six weeks, with sessions gradually increasing in length. The trial is registered at ClinicalTrials.gov as NCT00852592. This guide is part of our library of New York bipolar guides.
Results were striking: by weeks four to six, about 68% of the bright light group reached remission compared with about 22% of the placebo group, and the bright light group also showed better functioning. The researchers chose midday timing because earlier reports had linked morning bright light to switches into mania or mixed states in people with bipolar disorder. Participants with mixed features or recent rapid cycling were excluded. These findings are encouraging but come from a relatively small study, and the researchers emphasized that people with bipolar disorder should not try light therapy on their own. Our guide on sleep regularity in bipolar depression covers other circadian strategies.
For New Yorkers facing short, gray winter days, light therapy may help bipolar depression when it’s timed and supervised carefully. NIMH estimates that 2.8% of U.S. adults had bipolar disorder in the past year, at similar rates in men (2.9%) and women (2.8%). Secure video visits from anywhere in New York can make it easier to start bipolar care and keep regular follow-ups without extra travel.
What the research found, why timing matters, and using light therapy safely are the three topics this guide covers.
Choosing a light box
Light boxes vary. Clinical studies use specific intensities, measured in lux, at specific distances. A clinician can help you choose a device and set up a safe schedule. Not all products marketed for mood deliver the same light. Following guidance on distance and duration matters.
Seasonal patterns
Some people with bipolar disorder notice depression in winter and highs in spring or summer. Light therapy may be one tool for winter depression, used carefully. Mood charting over a year can reveal seasonal patterns and help plan ahead, including when to start or stop light therapy and when to watch for highs.
Light Therapy for Bipolar Depression at a glance
| Feature | Summary |
|---|---|
| Participants | Adults with bipolar depression on stable antimanic medication |
| Treatment | 7,000-lux bright white light at midday |
| Placebo | Dim red light |
| Timing | Around noon to early afternoon |
| Remission at weeks 4 to 6 | 68% vs. 22% |
Why timing matters
Light is a powerful signal to the body’s internal clock. Morning light can shift circadian rhythms in ways that help seasonal depression but may destabilize mood in bipolar disorder, potentially triggering hypomania or mania. The midday timing in the trial aimed to get antidepressant benefits while reducing that risk. Timing, intensity and duration all matter, which is why supervision by a clinician who knows bipolar disorder is important.
Using light therapy safely
If you and your clinician decide to try light therapy, it’s typically added to mood-stabilizing treatment, not used instead of it. Sessions often start short and increase gradually. Mood charting tracks sleep, energy and mood closely, since early signs of hypomania, like sleeping less, racing thoughts or unusual energy, call for stopping or adjusting. People with eye conditions or on light-sensitizing medications should check with their doctor first. Our guides on sleep regularity in bipolar depression and mood charting for bipolar depression cover related topics.
Light therapy guidance for New York patients
Light therapy plans can be discussed and monitored during secure video visits. Visits run by secure video anywhere in New York, while you’re physically in the state. The practice is in-network with Aetna and Cigna; confirm your New York plan with the office, and see self-pay fees on the Good Faith Estimate page.
Other approaches
Light therapy is one of several options. Medications approved for bipolar depression, mood stabilizers, therapy, regular sleep and routines remain the foundation. Light therapy may add benefit for some people. Your clinician will help decide whether it fits your situation.
When to seek help
Stop light therapy and contact your clinician if you notice signs of hypomania, like much less sleep, racing thoughts or unusual energy. Seek help if depression worsens. Thoughts of suicide need immediate help through 988, and call 911 in an emergency. Light therapy can help bipolar depression when it’s used carefully.
Key Takeaways
- Midday bright light added to mood stabilizers helped in a randomized trial.
- Remission was 68% with bright light vs. 22% with placebo light.
- Morning light has been linked to switches into mania in bipolar disorder.
- Light therapy should be supervised, not tried alone.
The Bottom Line
Light Therapy for Bipolar Depression is common and treatable, and careful care can make daily life feel more manageable.
Frequently Asked Questions
Does light therapy work for bipolar depression?
A randomized trial found midday bright white light added to stable antimanic medication helped bipolar depression. About 68% of the bright light group reached remission versus 22% with placebo light. The study was relatively small. Findings are encouraging but need confirmation. Light therapy should be supervised.
Why is light therapy timing important in bipolar disorder?
Earlier reports linked morning bright light to switches into mania in bipolar disorder. The trial used midday timing to reduce that risk. Light affects the body's internal clock. Timing, intensity and duration all matter. A clinician can help set a safe schedule. An evaluation can clarify what's happening and which options fit.
Can I try light therapy on my own for bipolar depression?
No, researchers emphasized that people with bipolar disorder should not try light therapy on their own. It's usually added to mood-stabilizing treatment. Mood charting helps watch for hypomania. A clinician can guide timing and device choice. Supervision makes it safer. An evaluation can clarify what's happening and which options fit.
What are signs light therapy is causing a high?
Signs include needing much less sleep, racing thoughts, unusual energy, irritability or impulsive behavior. If these appear, stop light therapy and contact your clinician. Mood charting helps catch early changes. Adjustments can be made. Safety comes first for most people. An evaluation can clarify what's happening and which options fit.
Does light therapy replace medication for bipolar depression?
No, in the trial, light therapy was added to stable antimanic medication. Medications approved for bipolar depression and mood stabilizers remain the foundation. Light therapy may add benefit for some people. Regular sleep and routines matter too. Your clinician will help decide. An evaluation can clarify what's happening and which options fit.
Can light therapy for bipolar depression be monitored by video in New York?
Yes, light therapy plans can be discussed and monitored during secure video visits anywhere in New York. You need to be physically in New York during each visit. Mood charts are reviewed together. The practice is in-network with Aetna and Cigna; confirm your New York plan with the office. Your clinician can guide device choice and timing.
Where to go from here
- Right now, if you're not safe
- Call or text 988, or call 911.
- If you'd like an evaluation
- See how scheduling and telehealth work on the new patient page.
- If you want to keep reading
- Return to the NY bipolar depression resource center for more guides. For more help preparing and finding care, see NIMH’s tips for talking with your health care provider.
How We Reviewed This Page
Written by Steven Lockhart of Health Marketing Group and clinically reviewed by Gabriella I. Farkas, MD PhD, a board-certified psychiatrist. Clinical information comes from the sources listed below, and the page is reviewed every 180 days or when guidance changes.
What’s new: September 29, 2026. Page published.
References
- ClinicalTrials.gov. Light Therapy for Bipolar Depression, NCT00852592; Sit et al., Am J Psychiatry 2018. https://clinicaltrials.gov/study/NCT00852592
- National Institute of Mental Health. Bipolar Disorder statistics. https://www.nimh.nih.gov/health/statistics/bipolar-disorder
- 988 Suicide & Crisis Lifeline. https://988lifeline.org/
- Tips for talking with your health care provider. https://www.nimh.nih.gov/health/publications/tips-for-talking-with-your-health-care-provider