Photonic / Light

Light and photon emission. Photobiomodulation has a real photoacceptor and a defined dose-and-wavelength window; the wider colored-light spectrum (blue for acne, green at the frontier, polarized-light lamps) ranges from cleared to marketing-ahead-of-evidence. Ultraweak photon emission is a real biomarker whose therapeutic “biophoton” reading is not.

Photobiomodulation / LLLT — Low-Level Light TherapyLight with a real photoacceptor mechanism. The strongest, RCT-meta-analytic evidence attaches narrowly to androgenetic alopecia (hair regrowth above placebo); other niches — pain, wound healing — are of variable, generally weaker quality and are stated as such.Evidence-supported grade B Biophoton (Popp / UPE)Ultraweak photon emission (UPE) is real, measurable, and a genuine biomarker frontier; the therapeutic 'biophoton information field' interpretation is unproven. Substrate real, therapy under study.Insufficient evidence / under study grade E Gurvitch / Kaznacheev Mitogenetic RadiationA genuine early scientific attempt whose central claim — UV photons signalling mitosis at a distance — was contradicted by replication. The real visible-range UPE substrate survives and is credited under Biophoton / UPE.Insufficient evidence / under study grade F Terahertz 'Therapy' (consumer wands: iTeraCare / TeslaCare)Consumer 'terahertz' wands are infrared/thermal blowers with a quartz tube — the carrier is IR, so they belong with light, not sensing. They emit no terahertz. The real effect is heat. Terahertz as a scientific field (imaging, spectroscopy, therapeutic research) is real and does not apply to these devices.Insufficient evidence / under study grade E PDT / Chlorin e6 — Photodynamic TherapyA regulator-cleared oncology modality with a real dose/target/mechanism triad: a photosensitizer accumulates in target tissue, then laser light at its absorption wavelength generates reactive oxygen species that kill tumour cells. The legitimate Russian/Belarusian photonic strand — distinct from 'photostim' wellness marketing that borrows the chlorin-e6 name.Evidence-supported grade B/C Circadian & Melanopic LightingNOT photobiomodulation and NOT gamma sensory stimulation. The circadian-entrainment mechanism is well established; building-scale outcome data are weak — grade at the upper end of the tier.Insufficient evidence / under study grade B/C