For seasonal affective disorder (SAD), the general starting point is a purpose-built, low-UV light box used in the morning—usually within the first hour after waking. Published guidance differs on session length: Mayo Clinic suggests about 20–30 minutes, while the National Institute of Mental Health (NIMH) suggests about 30–45 minutes. Use the distance and schedule specified for your device, and ask a clinician for advice if you have bipolar disorder, certain eye conditions, recent eye surgery, or take medication that increases light sensitivity.
Set up a morning routine
- Choose the right time: Use the light box soon after waking. Mayo Clinic recommends within the first hour; NIMH describes using it usually first thing in the morning. These recommendations are relative to your wake time, not a fixed clock hour.
- Follow the device’s distance instructions: Mayo Clinic gives about 16–24 inches (41–61 cm) from the face as typical guidance, but the manufacturer’s specified distance takes priority. A lux rating depends on how far you sit from the light.
- Keep your eyes open, but do not stare at the lamp: Position it for indirect exposure while you sit nearby. You do not need to look directly into the light.
- Use it consistently if that is your treatment plan: NIMH describes daily use from fall to spring; the National Center for Complementary and Integrative Health (NCCIH) describes daily use from early fall until spring. Your clinician may recommend a different plan.
How long should you use a SAD light?
There is no single session length shared by all of the cited patient guidance. Mayo Clinic’s 2022 guidance gives about 20–30 minutes; NIMH gives about 30–45 minutes; and NCCIH gives a broader 20–60-minute range. These are general recommendations, not interchangeable prescriptions or a guarantee that a particular duration is right for every device or person.
Follow your light box’s instructions and ask your health care provider which schedule fits your device and circumstances. Do not assume that a shorter session is equivalent across different lamps: brightness at the stated sitting distance matters.
What to look for in a light box
- Purpose-built for SAD or bright-light therapy: Do not substitute a lamp intended for skin treatment. Mayo Clinic warns that skin-treatment lamps may emit UV, which can damage the eyes if used incorrectly.
- About 10,000 lux at the specified distance: Mayo Clinic (2022), NIMH, and the NHS describe 10,000 lux as a typical or standard brightness. Check the distance associated with that rating; a headline lux figure does not tell you the exposure at every position.
- Low or no UV output: Mayo Clinic recommends a box that filters most or all UV. The NHS advises UK readers to choose a UV-free light.
- A setup you can use consistently: Choose a size and position that fit your morning routine while allowing you to maintain the manufacturer’s recommended distance.
- Appropriate conformity marking for your region: The NHS advises UK buyers to look for UKCA or CE marking. That is UK-specific guidance, not a universal requirement.
When to ask a clinician before starting
Get medical advice before using a SAD light if you have bipolar disorder or a history of manic or hypomanic symptoms, an eye or retinal condition, recent eye surgery, or take medication that increases light sensitivity. Mayo Clinic notes that timing and suitability need careful review for people with bipolar disorder; increasing exposure too quickly or using a light box for too long may trigger manic symptoms. The 2025 International Society for Bipolar Disorders task force recommendations concern bipolar disorder specifically, rather than serving as a general schedule for everyone.
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Headache, dizziness, nausea, eye strain or tired eyes, and sleep disturbance are among the side effects noted by NCCIH and the task force review. Contact a clinician if side effects are severe, your sleep worsens, or you notice unusual mood activation.
What the guidance does—and does not—settle
The sources agree on morning use and low-UV light boxes, but they give different typical session lengths. They do not establish one universally appropriate start date, end date, or daily schedule for every person. The NHS says light therapy is not usually available through the NHS because it considers the evidence insufficient to establish whether it is effective; that statement describes the NHS service context, not proof that light therapy is ineffective.
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For practical device selection, the Mayo Clinic’s light-box guidance explains distance, brightness, and UV considerations. See also the NIMH SAD overview, the NHS SAD guidance, and NCCIH’s overview.
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