Light therapy for depression: does season matter?

NCT ID NCT07599124

Completed Symptom relief Sponsor: Geestelijke Gezondheidszorg Eindhoven (GGzE) Source: ClinicalTrials.gov ↗

First seen Jun 24, 2026 · Last updated Jun 27, 2026 · Updated 1 time

Summary

This study looked at whether bright light therapy helps depression equally well in spring/summer compared to autumn/winter. Over 200 adults with depression received daily 30-minute light sessions for at least a week. Researchers measured symptom changes and followed up for three months to see if the season affects how well the treatment works.

What this could mean

Our plain-language read of the trial. This is informational only — not medical advice or a prediction.

Active substance: Bright light therapy (10,000 lux LED lamp)
What this could lead to: If successful, this could show that light therapy works year-round for depression, not just in darker seasons.
What could go wrong: This is a completed observational study, not a large controlled trial. Results may not apply to all types of depression, and individual responses vary.

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Conditions

The condition(s) this trial relates to.

bipolar depression Depression depressive disorder endogenous depression

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

BIPOLAR DEPRESSION DEPRESSED PHASE DEPRESSION UNIPOLAR DEPRESSION

Contacts and locations

Locations

GGzE

Eindhoven, 5626ND, Netherlands

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