When the autumn and winter gloom sets in and the days grow shorter, your mood may take a sharp dip. If this feeling lasts for weeks, you may be experiencing seasonal affective disorder (SAD), a depressive disorder that affects 1% to 10% of the population, most often women and younger people [1]. The good news is that you can help yourself – one effective method is LED light therapy at home.

SEE ALSO: LED phototherapy – the science behind how it works

What is seasonal depression?

Seasonal depression (SAD) occurs cyclically between October and March. The body responds to the lack of sunlight – serotonin (the happiness hormone) levels drop, while melatonin (the sleep hormone) levels rise [2]. The result? You wake up tired despite sleeping for a long time, constantly crave sweets, find it hard to focus, and have no energy. Many people withdraw from social contact and feel as if their lives have come to a standstill. 

If these symptoms persist for more than two weeks, make an appointment with a psychiatrist – seasonal depression is a serious condition that requires diagnosis and often medication. Phototherapy is just one part of supportive treatment.

What are the benefits of LED phototherapy for seasonal depression?

LED light therapy works simply: bright light signals to your brain that it’s time to be active. Your body suppresses melatonin production and starts producing more serotonin – boosting your energy, improving your mood, and making it easier to focus [3].

Studies show that both blue light (around 468 nm), which suppresses melatonin and regulates circadian rhythms [4], and red light (630-670 nm), which affects not only the skin but also the nervous system, can be effective. Regular exposure may reduce tension, improve sleep, and ease symptoms of chronic stress [5].

SEE ALSO: LED phototherapy at home – benefits and uses

How long should a single LED therapy session last?

For blue light, daily sessions of 30-45 minutes are effective - in a study of patients with SAD, 45-minute exposure over 3 weeks significantly improved symptoms [6]. Similarly, 30-minute blue light sessions over 6 weeks improved sleep quality and mood in people with brain injuries [7].

Red light requires less time - sessions of 15 to around 30 minutes are effective, with improvements in cognitive function and mood. In general, effective light therapy sessions last from 30 minutes to 2 hours a day, with morning exposure producing the best results [8].

Does LED phototherapy have any side effects?

LED phototherapy is safe and well tolerated by the body, although at first you may have trouble falling asleep or feel slightly stimulated - this is temporary. If you have trouble sleeping, it’s recommended that you adjust your light exposure time, for example by avoiding therapy in the evening, as evening exposure is more likely to cause sleep disturbances [9].

What makes modern LED lamps stand out?

Modern LED lamps emit light similar to daylight, but without harmful UV rays. They’re energy-efficient, don’t heat up, and last for years. Most importantly - LED light therapy at home is truly convenient. You can switch on the lamp while having your morning coffee, working at your computer, or reading a book.

If you’re looking for extra support, you could consider devices that combine different types of light therapy. ZENT® DermaLight™ Mask uses four wavelengths (including blue, red, infrared, and yellow light). It features 216 LEDs positioned to illuminate the face evenly. The mask is ultra-lightweight (just 93 g), made of medical-grade silicone, and wireless.

SEE ALSO: Is an LED mask worth it? The specs that really matter

Seasonal depression doesn’t have to be your companion throughout fall and winter. LED light therapy is a proven, safe solution that restores your body's natural rhythm. Regular morning sessions will improve your mood, boost your energy, and help you function normally during the dark months. However, remember – it's always worth consulting a psychiatrist or psychologist. Phototherapy works best as part of a comprehensive approach to mental health.

FAQ – frequently asked questions

Is LED phototherapy safe?

Yes, provided you use certified medical lamps. Do not extend the sessions – 30 minutes a day is more than enough. If you have vision problems (glaucoma, cataracts), consult an ophthalmologist.

When will I feel better?

Most people notice an improvement in their mood after 3-7 days of regular use.

Can I combine phototherapy with medication?

Yes, phototherapy is an excellent complement to treatment provided by a psychiatrist. However, never stop taking your medication on your own – always consult your doctor.

How much does it cost?

A good therapy lamp costs 300-1,500 zł. It’s a one-time investment – the device will serve you for many seasons. 

---

References

[1] Akkaoui M.A. et al. (2025). "Screening and evaluating seasonal affective disorder: a systematic review of available assessment tools". Journal of Psychiatric Research.

[2] Lee T.M.C. et al. (2001). "Monoaminergic function in the pathogenesis of seasonal affective disorder". The International Journal of Neuropsychopharmacology.

[3] Chról M. et al. (2025). "Exploring the role of phototherapy in the management of Seasonal Affective Disorder". Journal of Education, Health and Sport.

[4] Glickman G. et al. (2006). "Light Therapy for Seasonal Affective Disorder with Blue Narrow-Band Light-Emitting Diodes (LEDs)". Biological Psychiatry.

[5] Rojas J.C., Gonzalez-Lima F. (2011). "Low-level light therapy of the eye and brain". Eye and Brain, 3, 49-67.

[6] Alotaibi M.A. et al. (2015). "A systematic review of light therapy on mood scores in major depressive disorder: light specification, dose, timing and delivery". International Journal of Basic and Applied Sciences.

[7] Raikes A. et al. (2020). "Daily Morning Blue Light Therapy Improves Daytime Sleepiness, Sleep Quality, and Quality of Life Following a Mild Traumatic Brain Injury". Journal of Head Trauma Rehabilitation.

[8] Pjrek E. et al. (2019). "The Efficacy of Light Therapy in the Treatment of Seasonal Affective Disorder: A Meta-Analysis of Randomized Controlled Trials". Psychotherapy and Psychosomatics.

[9] Maruani J. et al. (2019). "Bright Light as a Personalized Precision Treatment of Mood Disorders". Frontiers in Psychiatry.