The thinking behind the spectrum.
How we chose eight wavelengths, what they're calibrated to do, and why the system is built around an intelligence rather than a switch.
Red and near-infrared.
Red light at approximately 630nm, and near-infrared at approximately 830nm, are the most extensively studied wavelengths in cosmetic light therapy. Both sit within what's sometimes called the optical window of the skin — wavelengths that the skin's surface allows through to deeper layers, where they can interact with cellular structures associated with the visible signs of healthy-looking skin.
In the Spectrum Mask, red and near-infrared are delivered together as a single channel — the wavelengths CELA™ returns to most often.
Blue.
Blue light at approximately 415nm has a long history in cosmetic light therapy, particularly for supporting the look of clearer, calmer-looking skin. It sits at the shorter end of the visible spectrum, with a more surface-level interaction than red or near-infrared.
In the Spectrum Mask, blue is the third foundation wavelength. CELA uses it most often in sessions where your latest scan suggests clarity is the priority.
And five more, each with a defined role.
The five remaining wavelengths are not standalone treatments. They are part of a tuned system, each chosen because it gives CELA a specific colour to call on within a session.
We describe them here with deliberate restraint. The evidence base for each is narrower than it is for red, near-infrared and blue, and we'd rather be honest about that than overclaim.
Yellow
A warm-spectrum wavelength sitting between green and red. Yellow light is associated with skin that looks comforted and luminous, and is often used in cosmetic settings where a gentler, more diffused light is preferred.
Green
A mid-spectrum wavelength selected for its visual quietness. Green sits at the centre of the visible range and has a balancing character — neither warm nor cool.
Cyan
A cooler-spectrum wavelength sitting between blue and green. Cyan was selected for its association with skin that looks refreshed and awake.
Orange
A composite wavelength bridging yellow and red. Orange brings warmth to the spectrum and is often used in sessions where a richer, more glow-supporting register is wanted.
Purple
A composite wavelength bridging blue and red — the two ends of the visible spectrum, delivered together. Purple extends the spectrum's reach.
Why eight wavelengths only matters if something can choose between them.
The mask delivers. CELA decides. Your skin guides both.
The reason the Spectrum Mask has eight wavelengths is not because eight is better than four, in itself. It is because eight gives CELA enough spectrum to personalise across — enough range to respond to what your Smart Scan tells her.
CELA reads your skin and generates a nine-metric reading, then uses that reading to decide which wavelengths to include in your next session, at what intensity, for how long, and in what sequence.
Bring the science home.
Eight wavelengths. One intelligence. A ritual personalised to you.
CellSync™ products are cosmetic. They are not medical devices, and any references to results refer to the visible appearance of skin — not medical claims. The Spectrum Mask is a UKCA-certified cosmetic light therapy device for home use, and is not registered with the MHRA. If you have a medical concern about your skin, please speak to a qualified healthcare professional.