Effects of Different Light Intensities in the Morning on Dim Light Melatonin Onset

Significant phase advances of melatonin onset were observed at light intensities of 3000 lux, 6000 lux, and 12,000 lux.

• Exposure to light in the morning may influence the timing of melatonin release.
• Dim light exposure (<30 lux) was used as a baseline for comparison.
• The study involved 11 healthy males aged 21-31 over two experimental days.
• Saliva samples were collected every 30 minutes during the evening to assess melatonin levels.
• Findings suggest that specific light intensities can alter melatonin secretion within a single day.

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