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— Science without the marketing fog
What we actually know about red light.
Look beneath the surface first. Then separate measurement, biological hypothesis and a human outcome. No magic. No false certainty.
Interactive photobiomodulation guide
Light beneath the surface.
Schematic 3D model
— Three sentences are enough
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Equal energy does not necessarily mean an equal cellular response.
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More light does not automatically mean more effect.
— Human evidence
One persuasive study. Not a universal promise.
A controlled study of 136 people observed changes in skin appearance, ultrasound collagen density and fine wrinkles with specific polychromatic devices and a specific protocol. That is a relevant human outcome. It is not a test of OVERDOZE panels or proof that any panel and dose will do the same.
Wunsch & Matuschka · 2014 ↗— Limits
What this cannot establish.
One wavelength does not automatically equal one specific indication. A cell experiment cannot promise a health outcome in a person. Five wavelengths are not, by themselves, evidence of five times the efficacy. Surface dose is not target-tissue dose and does not determine the outcome by itself.
— In practice
Measure. Calculate. Do not overdo it.
For a panel, spectrum, real irradiance at a stated distance and power draw are useful facts. Irradiance and time give incident energy. Use our calculator for a specific model and begin conservatively — not because we know one universal optimum, but precisely because we do not.
— Safety
A panel is not a diagnosis or treatment.
Do not look directly into the diodes. Use eye protection when applying light to the face. Consult a physician before use if you are pregnant, have a cancer diagnosis, photosensitivity, an eye condition or take photosensitising medication.
— Traceable evidence
Science. Questions included.
The models explain principles. Each source also states what cannot be claimed from it.
Girasol et al. · 2024 — Light transmission through human tissueHuman measurement · In-vivo measurement, 30 people
Under the measured conditions, more 830 nm light passed through skin than 660 nm light. The result depended on tissue, melanin and the device. It does not establish a universal ranking or depth for all wavelengths.
Open study on PubMed ↗Sharma et al. · 2011 — ATP, ROS and biphasic responseCell experiment · Primary mouse neurons in culture
At 810 nm, ATP and mitochondrial-potential changes varied with dose. A cell experiment cannot be converted into universal human panel dosing.
Open study on PubMed ↗Pope & Denton · 2023 — What happens in the respiratory chainCell experiment · Isolated mitochondria
808 nm light affected complexes III and IV differently; equal energy at different irradiance did not produce the same response. The exact initiating mechanism remains unresolved.
Open study on PubMed ↗de Freitas & Hamblin · 2016 — Proposed PBM mechanismsScientific review · Mechanism review
Reviews the NO photodissociation-from-CCO hypothesis and possible alternative pathways. A hypothesis is not a certain universal mechanism in every cell.
Open study on PubMed ↗Tong et al. · 2025 — Another pathway: TRPV1 and calciumCell experiment · Human meniscus cells in culture
Under the tested conditions, the response involved TRPV1, calcium and ROS without changes in CCO or NO. This shows that mechanisms may vary; it is not evidence for a specific panel.
Open study on PubMed ↗Wunsch & Matuschka · 2014 — Skin, collagen and a specific light protocolHuman study · Controlled study, 136 people
With specific polychromatic devices and a specific protocol, changes were observed in skin appearance, ultrasound collagen density and fine wrinkles. The study did not test OVERDOZE panels and cannot be generalised to any device or dose.
Open study on PubMed ↗Zadik et al. / MASCC–ISOO · 2019 — A narrowly defined clinical useScientific review · Systematic review and guideline for oral mucositis
The recommendation concerns oral-mucositis prevention in narrowly defined oncology protocols. It is not evidence for home panels or cancer treatment in general.
Open study on PubMed ↗Chung et al. · 2012 — Basic principles of photobiomodulationScientific review · Review of principles and mechanisms
Describes PBM as a non-ionising light stimulus and reviews how response depends on exposure parameters. A mechanism review alone does not prove a health outcome for a specific product.
Open study on PubMed ↗Evidence last checked: 23. 9. 2026