The fix isn't complicated.
Morning: get blue + violet light (405nm, 470nm) within 30 min of waking.
Evening: eliminate blue. Use amber + red only (590nm, 630nm).
Your mitochondria will respond within days.
Energy up. Sleep deeper. Brain clearer.
Violet. 405nm. Neuropsin (OPN5) sets local circadian clocks in skin and cornea. When violet light is absent, these peripheral oscillators lose entrainment even when the master clock in the brain remains stable. (PMID: 31607531) π΄
Blue. 470nm. OPN4 containing cells project directly to the pineal gland, the suprachiasmatic nucleus, and the lateral hypothalamus simultaneously. One photon. Three destinations. The system is parallel, not sequential. π΄
Violet. 405nm. Neuropsin expression is highest in morning tissues β retina, hypothalamus, skin. The body front-loads its violet sensitivity at dawn. That timing is not coincidence. It is architecture. π΄
Amber. 590nm. The eye evolved in a world where amber was the last light before dark. Firelight. Sunset. The nervous system interprets amber as: safety, warmth, wind down. The opsin system is not metaphor. It is mechanism. π΄
Deep NIR. 850nm. Glymphatic waste clearance in the brain peaks during deep sleep. ATP powers the glymphatic pumping cycle. Deep NIR at 850nm at the right time is not sleep hacking. It is energy supply for a biological system that already exists. (PMID: 35328396) π΄
Near-IR. 760nm. The blood-brain barrier is not impermeable to photons. 760nm penetrates 3 to 5cm through tissue. Neurons in the prefrontal cortex receive a measurable signal from external near-infrared exposure. π΄
Deep Red. 660nm. Collagen synthesis is downstream of ATP. Red and deep red light increase mitochondrial output. More ATP, more collagen precursors, faster repair. The mechanism is metabolic, not cosmetic. π΄
Red. 630nm. The retina has the highest metabolic rate of any tissue in the body. It consumes more oxygen per gram than the brain. Red light at 630nm reduces that metabolic load and improves outer retinal function. π΄
Amber. 590nm. Three hours of amber-only light before sleep produced measurably better slow-wave sleep onset in controlled conditions versus standard room illumination. Opsins respond to color. The clock responds to opsins. π΄
Blue. 470nm. Seasonal affective disorder is a failure of OPN4 signaling in winter. Shorter days, less dawn blue light, slower ipRGC firing. The clock drifts. The mood follows the photons. π΄
Violet. 405nm. In the deep ocean β total darkness β creatures still maintain circadian rhythms. OPN5 opsins respond to bioluminescent violet flashes. The clock predates sunlight as we know it. π΄
Deep NIR. 850nm. Transcranial photobiomodulation at 850nm increases cerebral blood flow and oxygenation in prefrontal regions. The light does not stop at the skull. Physics does not negotiate with anatomy. π΄
Near-IR. 760nm. OPN3 β encephalopsin β was first found in the brain, not the retina. It absorbs near-infrared. Neurons are not blind to light. They have been reading it since before eyes existed. (PMID: 10234000) π΄
Deep Red. 660nm. The question is not whether red light works. The mechanistic pathway β cytochrome c oxidase, ATP, nitric oxide β is published, replicated, and accepted in photobiology. The question is always dose and delivery. π΄
Red. 630nm. Photoreception is not only in the eye. Skin keratinocytes express OPN2 and OPN3. Expose skin to red light and gene expression shifts within 20 minutes. The body reads light everywhere it lands. π΄
Amber. 590nm. Melatonin suppression is a blue light story. But local melatonin β made inside mitochondria β is a different molecule serving a different function. Amber supports local synthesis without touching the pineal. π΄
Blue. 470nm. The suprachiasmatic nucleus receives direct input from intrinsically photosensitive retinal ganglion cells β ipRGCs β loaded with OPN4. Remove them and the circadian rhythm survives daylight but loses its anchor. π΄