Beyond circadian rhythm, specific light wavelengths (red, near-infrared) penetrate tissue and boost mitochondrial function — a field called photobiomodulation.
660nmoptimal red light wavelength
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Match the light to its effect
Connect each light type to its biological impact.
This step is hands-on. Open the Thier app to try the full interaction.
Fact
Morning sunlight outranks every device
5-10 minutes of natural sunlight within an hour of waking — even on a cloudy day at ~10,000-50,000 lux — anchors the circadian rhythm and produces a cleaner cortisol curve than any lamp. Indoor lighting peaks at ~500 lux. The strongest signal nature gives your master clock is the contrast between morning sunlight (very bright, blue-shifted) and dim evening (warm, red-shifted). Match it.
5-10 minmorning sunlight, within 1h of waking
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Red light therapy — what it does + doesn't do
Tap each claim.
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Evening light hygiene
Tap each habit — most people do the opposite.
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Takeaway
Key Takeaway
Morning sunlight is the #1 light hack. Red/NIR light therapy is promising for skin, joints, and energy but requires the right dose and wavelength.
Track your progress
Read the cards above, then mark this lesson complete to track your progress.