Two wavelengths carry almost all the evidence: red at around 660nm and near-infrared at around 850nm. They work on the cells beneath the surface, not on top of it. Results are gradual, measured over four to twelve weeks, and they are about the appearance of firmer, smoother, brighter skin rather than erasing anything.
Why light does anything at all
Almost everything on a bathroom shelf works at the surface. Cleansers, acids, serums, moisturisers. They are doing real work, but they are doing it on the outermost layers.
The reason skin loses firmness and brightness is happening further down, in the cells that produce collagen. Inside those cells sit mitochondria, the small structures that generate the energy a cell needs to do its job. As we age, they slow down. The cell has less energy available, so it produces less collagen, and the skin above it gradually loses its bounce and its light.
Red and near-infrared light are absorbed by those mitochondria. The working explanation in the literature is that this absorption improves their energy output, which gives the cell more to work with. It is a nudge rather than a transformation, and it is the reason results build over weeks rather than days.
The wavelengths that matter
Wavelength is measured in nanometres, and it determines how deep the light travels and what it interacts with. This is the single most useful thing to understand, because it lets you judge any device in about thirty seconds.
660 nm
Red
Works nearer the surface, in the layers where firmness and radiance show. The most studied range in skin research, and the wavelength almost every serious device is built around.
850 nm
Near-infrared
Invisible to the eye and reaches deeper than any topical product can. It is the wavelength most often left out of colour-led masks, because a light you cannot see does not photograph well.
There is a third wavelength worth explaining rather than glossing over.
460 nm
Blue
Blue light does not reach the deeper layer and it is not there for firmness. It works at the surface and has its own separate body of research, relating to blemish-prone skin. Different wavelength, different job, different evidence. Our DermaOne includes it as a mode. What neither of our masks includes is green, yellow or purple, because there is nothing honest to say about them.
Seven colours is not seven times better. Two numbers do the work, and a third does a different job entirely.
The studies, by name
Most brands say "clinically proven" and hope nobody asks which clinic. Here are the papers people in this field actually cite, and what each one found.
Wunsch & Matuschka, 2014
Photomedicine and Laser Surgery · Controlled trial, 136 volunteers
The most-cited study in consumer red light therapy. Participants were treated with red and near-infrared light over roughly thirty sessions. The researchers measured collagen density using ultrasound imaging rather than relying on how people felt about their skin, and recorded significant increases against the control group. Improvements in the appearance of skin complexion and roughness were also reported, and the collagen density gains were still measurable at the twelve-week follow-up.
Lee et al., 2007
Journal of Photochemistry and Photobiology B · Randomised, double-blind, placebo-controlled, split-face
A more rigorous design: each participant acted as their own control, with one side of the face treated and the other not, and neither participant nor assessor knew which. Groups received red light, near-infrared, or both combined. All active groups showed statistically significant improvement in the appearance of wrinkles and skin elasticity against the placebo side. Skin biopsies showed increased collagen and altered matrix metalloproteinase activity, which is the enzyme process involved in collagen breakdown.
Barolet et al., 2009
Journal of Investigative Dermatology
Looked at the cellular mechanism rather than the visible outcome. Using 660nm light, the researchers found a meaningful increase in type-1 procollagen, the precursor the body uses to build collagen, alongside a reduction in the enzymes that degrade it. This is the paper most often used to explain why the visible results in the other studies occur.
An important distinction. These are studies on the technology — on red and near-infrared light at these wavelengths. They are not clinical trials of a Morra mask, or of any specific consumer device. We will say that plainly, because the brands that blur that line are the ones worth being careful with. What the research supports is the approach. What any individual device does depends on whether it delivers the right wavelengths at adequate strength.
Cleared is not the same as proven
This trips almost everybody up, and the category does very little to help.
Two different things, often blurred together
Published research tells you what a technology has been shown to do, in controlled conditions, measured independently. That is what the studies above are.
Regulatory clearance tells you that a regulator reviewed a submission about a specific device and made a determination. It says nothing about how well that device will work for you.
Our DermaOne is FDA-cleared as a Class II device, clearance number K253054. We publish that number so you can search it yourself rather than take our word for it. But a clearance is not evidence of results, and we would rather explain the difference than let you assume otherwise. If you want the full breakdown, including how to check any brand in about thirty seconds, we wrote a separate guide on it.
What the research does not say
Be careful of anyone claiming these
- That it removes deep, set wrinkles. It does not, and nothing you wear on your face does. The studies measure the appearance of fine lines, firmness and texture, not the erasure of structural lines.
- That results are immediate. The trials ran over four to twelve weeks of consistent short sessions. Anything promising overnight change is describing a different product from the one the research is about.
- That more colours means more benefit. The evidence sits with red and near-infrared. Blue has its own separate research for a different purpose. The rest are decoration.
- That it works for everyone identically. Individual results vary, as they do with anything. The studies report averages across groups, not guarantees for individuals.
- That a clearance proves efficacy. It proves a regulator reviewed a submission. Those are different claims.
How to use that knowledge
The practical value of all this is that it gives you a test you can run on any mask on the market, including ours.
Does the box print its wavelengths? If it proudly lists red around 660nm and near-infrared around 850nm, it is taking the research seriously. If it leads with the number of colours and buries or omits the actual nanometres, that tells you what it is competing on. Run that check on any mask you are considering. Ours prints both, on the front.
Our honest buying guide covers the rest of what to look for, and the realistic timeline sets out what to expect week by week.
Common questions
- Is red light therapy actually evidence-based?
- For the appearance of skin, at the specific wavelengths above, yes, more so than most at-home skincare categories. There are randomised, placebo-controlled, peer-reviewed trials. What is not well evidenced is the wider colour spectrum, or claims about erasing rather than improving the look of skin.
- Why do the studies use different session lengths?
- Protocols vary between trials, which is one reason the guidance is a range rather than a single number. In practice, around ten minutes on clean skin most evenings sits comfortably within what has been studied, and consistency matters more than session length.
- Does near-infrared really do anything if I cannot see it?
- Visibility has nothing to do with effect. Near-infrared sits just beyond the range human eyes detect, and it penetrates further than visible red. Lee et al. tested red and near-infrared separately and combined, and the combined group performed well, which is why serious devices run both.
- Why does it take weeks?
- Because it is working on cellular processes rather than on the surface. Collagen production is slow, and the studies reflect that. Most people notice something around week five. That is also why we make the routine ten minutes: the thing that delivers results is doing it consistently, so it needs to be easy enough to keep up.
- Is it safe?
- Red and near-infrared light in this range contain no UV and do not tan or burn the skin. Reported side effects in the literature are uncommon and mild. If you have a skin condition, are taking photosensitising medication, or have any concerns, check with a qualified professional first. More on safety here.
Built on everything above
Now you know the two numbers. Go and check the box.
Both our masks run red 660nm and near-infrared 850nm, printed on the front where you can see them. That is the whole test, and we would rather you ran it on us than took our word for anything.
New
DermaOne
Completely cordless. FDA-cleared Class II, K253054 — a number you can look up.
See the DermaOne
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DermaPro
Face and the neck most routines forget, in one ten-minute session.
See the DermaProRed 660nm · Near-infrared 850nm · Printed on the box · Free delivery
This page is for general information and education. It is not medical advice and is not intended to diagnose, treat, cure or prevent any condition. The studies referenced examine red and near-infrared light therapy as a technology; they are not clinical trials of Morra products. Cosmetic benefits described relate to the appearance of skin, and individual results vary. FDA clearance refers to a device's regulatory status in the United States; it is a determination of substantial equivalence, not an endorsement, not a guarantee of results, and it carries no legal effect in other markets. If you have a medical condition or any concerns, speak to a qualified healthcare professional.