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SAD lamp guide: how light therapy for winter depression is used
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- Carex Day-Light Elite Light Therapy Lamp. Best for: A larger, angled light at a desk or table. See options on Amazon
- Verilux HappyLight Mini. Best for: Small spaces and travel. See options on Amazon
What seasonal affective disorder is
NIMH describes SAD as a type of depression with a recurring seasonal pattern, with symptoms lasting about 4 to 5 months of the year. In winter-pattern SAD, symptoms usually start in late fall or early winter and ease in spring and summer; summer-pattern SAD is less common. Winter-pattern symptoms can include oversleeping, overeating with carbohydrate cravings and social withdrawal, alongside general depression symptoms such as persistent low mood, loss of interest, low energy and trouble concentrating.
NIMH lists depression symptoms such as a persistent sad, anxious or empty mood most of the day, nearly every day, for at least 2 weeks, feelings of hopelessness, and changes in sleep or appetite. Not everyone with SAD has every symptom. Feeling a little down in winter is common. If mood changes are significant and affect how you think and behave, NIMH says to talk with a health care provider.
How light therapy is used
NIMH says light therapy aims to make up for reduced natural sunlight in darker months. The person sits in front of a very bright light box every day, usually in the morning, from fall to spring. The light box is about 20 times brighter than ordinary indoor light and filters out potentially damaging UV light.
| Factor | What NIMH describes | Maker example |
|---|---|---|
| Brightness | 10,000 lux | Carex Day-Light Elite and Verilux HappyLight Mini both list 10,000 lux |
| Session length | About 30 to 45 minutes a day | Carex suggests 20 to 30 minutes each morning |
| Timing | Usually first thing in the morning, fall to spring | Verilux Mini has a countdown timer in 15 minute steps up to 1 hour |
Follow your provider's advice on timing and length, which may differ from a maker's suggestion.
Who should be careful
NIMH says people with certain eye diseases, or who take medicines that increase sensitivity to sunlight, may need alternative treatments or should use light therapy under medical supervision. Ask your provider or eye doctor before starting if either applies to you. Light therapy and vitamin D are treatments for winter-pattern SAD; NIMH notes there are no treatments specific to summer-pattern SAD.
Other proven treatments
NIMH lists four main treatment categories, used alone or together: light therapy, psychotherapy, antidepressant medicine and vitamin D. A form of cognitive behavioral therapy adapted for SAD, CBT-SAD, typically runs as two weekly group sessions for 6 weeks. When researchers compared CBT-SAD with light therapy, both were equally effective, though some symptoms improved slightly faster with light therapy. Vitamin D studies have produced mixed results, and NIMH says vitamin D can interact with some medicines.
Because SAD onset is predictable, NIMH says people with a history of it might benefit from starting treatment before fall, though few studies have tested prevention.
Comparing lamps
- Brightness at your seat. Look for a stated 10,000 lux and check the distance it applies to in the manual.
- UV-free light. Both Carex and Verilux describe their lamps as full-spectrum and UV-free, matching NIMH's note about filtering UV.
- Size and angle. Carex describes a large viewing area, downward-angled light and adjustable height and angle; the Verilux Mini is ultra-compact with a 90 degree adjustable stand.
- Settings. Carex lists four light settings; Verilux lists three brightness levels and a timer.
- Power. The Verilux Mini runs on USB-C with an included AC adaptor.
Using a lamp day to day
NIMH notes that the 988 Suicide and Crisis Lifeline is available for anyone in crisis. For everyday use, set the lamp up where you already sit in the morning, such as the breakfast table or desk, so the routine sticks. Read, eat or work while it is on rather than staring into it, and use it at about the same time each day. Keep a simple mood and sleep log to share with your provider. For winter dryness from indoor heating, see our cool mist humidifier guide.
What to look for when you buy
Carex Day-Light Elite Light Therapy Lamp
Best for: A larger, angled light at a desk or table
Carex lists 10,000 lux, a large viewing area, downward-angled light and four settings.
Watch out: Follow your provider on session length; Carex suggests 20 to 30 minutes.
See options on AmazonVerilux HappyLight Mini
Best for: Small spaces and travel
Verilux lists 10,000 lux, three brightness levels, a timer and USB-C power.
Watch out: Small panel; check the distance its lux rating applies to.
See options on AmazonQuestions people ask
- How bright should a SAD lamp be?
- NIMH describes a very bright light box of 10,000 lux.
- How long should I sit in front of a SAD lamp?
- NIMH describes about 30 to 45 minutes a day, usually first thing in the morning.
- Are SAD lamps safe?
- NIMH says light boxes filter out UV and are safe for most, but some eye diseases and medicines need supervision.
- Does light therapy work as well as therapy?
- NIMH says CBT-SAD and light therapy were equally effective in a direct comparison.
- When should I start using a SAD lamp?
- Light therapy is used from fall to spring; ask your provider about starting before symptoms.
Sources
- Seasonal Affective Disorder (nimh.nih.gov), National Institute of Mental Health
- Carex Day-Light Elite Light Therapy Lamp (carex.com), Carex
- HappyLight Mini (verilux.com), Verilux