Photobiomodu-what now? Light as medicine
Photobiomodulation. I know. Bear with me — this matters, and I promise it’s worth your seven syllables.
Photobiomodulation. I know. Bear with me — this matters, and I promise it’s worth your seven syllables.
There are clinics in this country selling ‘LED therapy’ with devices that don’t deliver enough light, of the right kind, to do what they’re promising.
Read that again.
A red light is not a red light is not a red light.
The wavelength matters — that’s the type of light.
The dose matters — how much of that light actually reaches your skin.
In medicine we call that dose ‘fluence’, and the rest of this article is going to make sense once you know that one word.
This is the part of aesthetic medicine nobody wants to talk about, because the marketing is so much easier than the science. So let’s talk about it. Where this treatment actually came from Low-level light therapy — the proper name is photobiomodulation — wasn’t invented to fix wrinkles. It was discovered in 1967 by a Hungarian physician named Endre Mester, who was trying to use lasers to treat tumours in mice. The tumours didn’t shrink. But the hair on the mice grew back faster, and their wounds healed quicker. That accidental observation built a field.
NASA picked it up in the 1990s, studying red and near-infrared light for wound healing in astronauts and for plant growth in space. The military funded research into accelerated healing for combat injuries. Dermatology adopted it for photoaging, acne, and post-procedural recovery. Plastic surgery uses it post-operatively to reduce inflammation, oedema, and scarring.
Among the people who took this from interesting laboratory science to validated clinical medicine is Professor R. Glen Calderhead — the principal researcher behind the Healite II and one of the most published authors in low-level light therapy globally. His work over several decades on optimal wavelength combinations, fluence parameters, and treatment protocols is part of the reason photobiomodulation has the evidence base it does today. When you read serious LED research, his name is on a meaningful chunk of it.
This is not a wellness trend. It’s a treatment with a sixty-year medical lineage that was hiding in plain sight while the beauty industry caught up.
What the evidence actually shows
Photobiomodulation works on a cellular level.
Specific wavelengths of red and near-infrared light penetrate tissue and are absorbed by the mitochondria — the energy producers in your cells. The light stimulates a process that increases cellular energy production, reduces inflammatory signalling, and supports tissue repair.
The evidence is strongest in three areas:
post-procedural healing and inflammation reduction,
mild-to-moderate inflammatory acne, and
certain types of musculoskeletal recovery.
The evidence is moderate for photoaging and skin texture.
The evidence is still emerging — and frankly oversold — for everything else you’ve seen on Instagram.
In my clinic I run a Healite II.
It’s the device Calderhead’s research helped build, used widely in dermatology and plastic surgery, with the wavelengths and fluence the literature was constructed around. I use it after every procedure to reduce inflammation and accelerate healing, and I run it as a structured package for post-operative wound recovery.
What I see clinically aligns with the published work: reduced downtime, faster resolution of post-procedural redness, and post-operative scars that mature significantly faster than they would otherwise.
That’s not a sales pitch. That’s what adequate dose plus correct wavelength plus consistent treatment looks like.
The gap nobody is talking about
Here’s where this gets uncomfortable.
A clinical-grade LED device is built to deliver a specific wavelength at a specific intensity for a specific duration.
The protocols exist because researchers like Calderhead spent decades figuring out exactly how much light, of what kind, for how long, achieves the cellular response. Change any of those variables and you change the outcome.
The LED mask your friend bought online may not be the same device. It might be the same colour. It is not necessarily the same medicine.
Many consumer masks deliver a fraction of the fluence required. Many use wavelengths that are slightly off from the research-validated range. Some are essentially decorative. The marketing implies clinical results because the marketing is unregulated. The device — when it’s a registered medical device — is.
Worse — and this is the part that makes me genuinely angry — there are clinics charging clinical-treatment prices for sub-clinical devices. Same colour of light. Wrong dose. Wrong wavelength. Same promises. That isn’t a grey area. That’s selling people a result the device cannot deliver.
How to evaluate any LED device — at home or in a clinic I’m not going to tell you which mask to buy. I’m going to tell you how to evaluate one — so you can apply the same filter to any device anyone tries to sell you, forever.
Four questions. Ask all of them.
One — what wavelengths does it use?
The research-validated wavelengths in skin are 415nm (blue, for inflammatory acne), 633nm (red, for collagen and texture), and 830nm (near-infrared, for deeper inflammation, healing, and tissue repair). If a device doesn’t tell you the exact wavelengths in nanometres — or hides behind vague phrases like “red spectrum” — that’s your answer.
Two — what’s the irradiance?
This is the intensity of light delivered to the skin, measured in milliwatts per square centimetre (mW/cm²). The clinical research range sits roughly between 40 and 150 mW/cm². Below 40, the device is unlikely to deliver enough energy to produce the cellular response the research describes. If a brand can’t tell you the irradiance number, assume it’s low.
Three — what’s the fluence per session?
Fluence is the total dose of light delivered, measured in joules per square centimetre (J/cm²). A device might have decent irradiance but only run for two minutes — and the dose is too low to matter. You’re looking for transparent specifications and treatment times that align with the published research.
Think of irradiance as how brightly the light is shining on your skin in any given moment, and fluence as the total amount of light it delivers over the whole session. Brightness × time = dose.
Four — is it actually regulated?
In Australia, that means TGA listed or registered, with a verifiable ARTG number you can look up on the TGA database yourself. A regulated medical device doesn’t make a product effective — but an unregulated one can promise anything.
If a device passes all four questions, you’re looking at a serious piece of equipment.
If it fails any one of them, the brand is asking you to take their word for it.
And — important — even the best at-home device is not a replacement for clinical-grade treatment of clinical-grade concerns.
At-home LED is an adjunct. It supports a plan. It’s the daily walk to your in-clinic gym session. Useful. Not the whole answer.
The real question
Light therapy is not a quick fix. It’s not a glow-up. It’s not a standalone treatment for serious skin concerns.
It is a well-evidenced, well-studied modality that — used correctly, with the right device, in the right context — accelerates healing, reduces inflammation, and supports skin recovery.
Used incorrectly, with an under-powered device and a list of inflated promises, it’s just expensive ambient lighting.
The question isn’t does LED work.
The question is: is the device you’re being treated with capable of delivering what the research actually shows, and is it being used inside a plan that makes sense for your skin?
That’s the standard.
Anything below it is theatre.
