INTRODUCTION: Depression is the most common mood disorder worldwide, with approximately 20 million adults affected in the United States in 2019. Current pharmacological treatments are not effective for all patients, often have significant side effects, and in some cases, require medical monitoring. Non-invasive brain stimulation (NIBS) techniques are emerging as a promising therapeutic alternative, offering fewer side effects. In this context, 60 Hz intermittent light stimulation may represent a promising and safe treatment option for depression. Animal studies have demonstrated that this form of stimulation can promote neuroplasticity, while studies in healthy individuals have shown the technique to be safe. However, 60 Hz intermittent light stimulation has not yet been evaluated in depressed patients in clinical trials. METHODS: This is an open-label study designed to assess the safety and tolerability of 60 Hz intermittent light stimulation (ILS) in individuals with moderate to severe depression. The trial will last six weeks in total, consisting of five sessions per week during the first two weeks, with one daily session (a total of 10 sessions, each lasting 30 minutes with 60 Hz white light stimulation), followed by two follow-up visits at weeks 4 and 6. Thirty patients aged 18 to 59 years with a current diagnosis of moderate to severe major depressive episode (HDRS-17 \> 16) and a stable antidepressant regimen for at least six weeks will be recruited. The primary outcome will be the safety and tolerability of the device. Clinical improvement will be assessed through changes in HDRS-17 scores and other validated depression and anxiety scales. EXPECTED RESULTS: The results of this pilot study may advance knowledge in the field and pave the way for future placebo-controlled clinical trials.