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The 630 nanometers red light has been precisely calibrated to a specific intensity which penetrates eyelids, detected by photosensitive cells, delivering the signal which prompts the body to relax and fall asleep.
The patented protocol was designed to run for 28 minutes: 14 minutes at the precise intensity required to support the release of natural melatonin, followed by a 14 minute fade out, as it’s important to sleep in darkness. The device turns off after the 28 minute cycle.