A plastic surgeon on the three numbers that decide whether an LED mask does anything
I have treated hundreds of patients with light therapy. These are the specifications I would want you to ask for before you spend anything.
I have spent twenty-eight years operating on skin, twenty-one of them in my own practice. In that time I have watched light therapy move from a device that lived in my treatment room to something people buy online for the price of a dinner.
The technology is real. I use it in my practice. What is not real is most of what is being sold.
The gap between a clinical light therapy device and a consumer mask is not a matter of degree. It is the difference between a treatment and an accessory that glows. And the number that separates them is one that almost no consumer brand publishes, because publishing it would end the conversation.
The three things that decide whether a mask does anything
Coverage
The neck and décolleté age visibly earlier than the face and are routinely left out. A mask that stops at the jawline is treating a third of what people actually look at.
Ours covers face, neck and décolleté, with 186 LEDs.
The face-only version carries 122 LEDs and covers the face.
Irradiance, which is the only number that matters
Irradiance is the power delivered to the surface of your skin, measured in milliwatts per square centimeter. It sets the dose you actually receive.
How this mask compares
Dose is irradiance multiplied by time. At 30 mW/cm2, a mask needs roughly 16 minutes to deliver what this one delivers in 10.
Light therapy follows a dose-response relationship. Below a threshold, the light reaches the skin and does nothing measurable. This is why two masks can share an identical wavelength on the box and behave entirely differently on your face.
Masks that publish a figure tend to cluster around 30. Many publish nothing at all. When a product page lists wavelengths but omits irradiance, that omission is the specification.
Wavelength, and how many
Different wavelengths of light are absorbed at different depths. A single-wavelength device is doing one thing. Ours emits four.
The specifications, in full
Face, neck and décolleté carries 186 LEDs versus 122 for face alone, 52% more LEDs, which is the concrete difference behind the $300 gap between versions.
Every one of these is on the page because a device that will not publish its numbers is asking you to take its word for it.
FDA clearance means the device has been reviewed and permitted for marketing. It is not an FDA endorsement of the product.
Why I developed it
I did not set out to sell a mask.
My patients kept asking me which one to buy, and every time I looked at what was available I found the same thing. Wavelengths on the box, no irradiance anywhere. Face coverage only. Plastic shells. A price that suggested a medical device and a specification that did not.
So I developed one to the standard I would want in my own treatment room, and I put the numbers on the page.
"I use it. My patients use it. That is the entire pitch."
How it is used
The common questions
Why is it more than a mask on Amazon?
Most masks in this category sit around thirty. Because of the irradiance figure above. Many masks do not publish an irradiance figure at all. Forty-eight is the irradiance this device delivers, and dose is what determines whether light therapy does anything. When a product page lists wavelengths but omits irradiance, that omission is the specification.
Is it safe to use every day?
It is designed for daily use. Most people find three to five sessions a week fits their life better than seven.
Can I use it after a procedure?
Ask whoever performed the procedure. Timing depends entirely on what was done.
Does it work on the neck?
That is a large part of why the face, neck and décolleté version exists. 64 of its 186 LEDs sit across the neck and décolleté. The face-only version does not include this.
Can I pay with HSA or FSA?
Yes. The mask qualifies for HSA and FSA payment through Truemed. Qualification is completed at checkout.
Ask any mask you are considering for its irradiance figure.
If it can, compare it to 48.
Developed by Dr. Shim Ching, MD, double board-certified plastic surgeon, Honolulu.