Seasonal depression and LED light therapy

When autumn-winter greyness appears outside the window and the days become shorter, your mood may sharply decline. If this feeling lasts for weeks, you may be dealing with seasonal affective disorder (SAD) – a depressive disorder affecting from 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.

What is seasonal depression?

Seasonal depression (SAD) appears cyclically between October and March. The body then reacts to the lack of sun – serotonin (the happiness hormone) levels drop, and melatonin (the sleep hormone) rises [2]. The effect? You wake up tired despite a long sleep, have a constant craving for sweets, find it hard to concentrate, and your energy drops to zero. Many people withdraw from social contacts and feel as if their life has come to a standstill.

In the photo, a woman sitting on a windowsill in a dark room, who is sad and holding her head. Seasonal depression

If these symptoms last longer than two weeks, make an appointment with a psychiatrist – seasonal depression is a serious disorder that requires diagnosis and often pharmacological treatment. Light therapy is only one part of supportive therapy.

What benefits does LED light therapy bring in seasonal depression?

LED light therapy works simply: intense light sends your brain a signal that it is time for activity. The body suppresses melatonin production and starts producing more serotonin – as a result, energy increases, mood improves, and it is easier to concentrate [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 acts not only on the skin but also on the nervous system, can be effective. Regular exposure may reduce tension, improve sleep, and lessen symptoms of chronic stress [5].

How long should one LED therapy session last?

For blue light, effective sessions last 30-45 minutes daily – in a study with SAD patients, 45-minute exposure for 3 weeks brought significant symptom improvement [6]. Similarly, 30-minute blue light sessions for 6 weeks improved sleep quality and mood in people after brain injury [7].

In the photo, two women sitting next to each other holding glasses of white wine, both dressed in robes – the woman on the left wears the ZENT® DermaLight™ – Intelligent LED mask for 4-in-1 light therapy on her face, the other on the right massages her neck with the ZENT MiniPulse™ – Compact Percussion Massager

Red light requires less time – effective sessions last from several to about 30 minutes, showing improvement in cognitive functions and mood. Generally, effective light therapy sessions last from 30 minutes to 2 hours daily, with morning exposure bringing the best results [8].

Does LED light therapy have side effects?

LED light therapy is safe and well tolerated by the body, although at first you may have trouble falling asleep or feel slight stimulation – this is temporary. In case of sleep problems, it is recommended to adjust the exposure time, e.g., avoid therapy in the evening, as evening illumination more often causes sleep disturbances [9].

What distinguishes modern LED lamps?

Modern LED lamps have light close to daylight but without harmful UV rays. They are energy-saving, do not heat up, and last for years. Most importantly – LED light therapy at home is truly convenient. You can turn on the lamp during your morning coffee, computer work, or reading a book.

If you are looking for additional support, you can consider devices combining various types of light therapy. ZENT® DermaLight™ Mask uses four wavelengths (including blue light, red and infrared, and yellow). It has as many as 216 LED diodes arranged to evenly illuminate the face. The mask is ultralight (only 93 g), made of medical silicone, and wireless.

ZENT MiniPulse™ – Compact Percussion Massager turned on in blue light mode, next to it lies the control remote

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

FAQ – most frequently asked questions

Is LED light therapy safe?

Yes, provided you use certified medical lamps. Do not extend sessions – 30 minutes daily is enough. If you have eye problems (glaucoma, cataract), consult an eye specialist.

When will I feel better?

Most people feel mood improvement after 3-7 days of regular use.

Can I combine light therapy with pharmacological treatment?

Yes, light therapy perfectly complements treatment conducted by a psychiatrist. However, never stop taking medication on your own – always consult your doctor.

How much does it cost?

A good therapeutic lamp costs 300-1500 PLN. It is 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.