Ketra S38
KetraNatural light emulation with tunable LED technology that follows the sun
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Related Protocols
Structured routines that use this product or are in the same category.
Morning Light Protocol
Get bright light in your eyes within 30 minutes of waking. This is the single most impactful thing you can do for circadian rhythm, energy, and sleep quality. Sunlight is best. Circadian lighting is the backup.
Morning Sun Before Screens
The rule is embarrassingly simple: sunlight hits your eyes before your phone does. No exceptions, no 'just checking one thing.' This single boundary recalibrates your circadian rhythm more than any sleep supplement, blackout shade, or smart mattress combined. It's the cheapest, highest-leverage protocol on the list — and the one most people refuse to do.