Featured image: Image from the Celluma collection.
The Celluma Journal · Updated
Light therapy begins when light is absorbed by molecules in tissue. These light-absorbing molecules are called chromophores. The resulting biological response depends on the wavelength, exposure and tissue being treated. This explains why a treatment programme matters more than simply seeing a red glow.
What is a chromophore?
A chromophore absorbs some parts of the light spectrum more readily than others. Skin contains several light absorbers, including melanin, haemoglobin and water. Other molecules are investigated as targets in photobiomodulation. Their different absorption properties affect how much light reaches and interacts with a treatment area.
The familiar lock-and-key analogy can be useful only up to a point. Biological absorption generally occurs across bands, not at one perfect nanometre with zero activity either side. A device using 630 or 660nm is not automatically ineffective because another uses 640nm.
Red and near-infrared light: biological signalling
Photobiomodulation research examines how red and near-infrared light influence cellular activity. Cytochrome c oxidase, a component of the mitochondrial respiratory chain, is one proposed photoacceptor. Changes in energy metabolism and signalling are studied as contributors to treatment responses.
The mechanism literature explains several proposed pathways that researchers continue to investigate. To understand what that means for your skin or hair, look at human evidence using a defined device, programme and outcome alongside the biological explanation.
Blue light and acne involve a different target
Acne-associated bacteria produce porphyrins that can absorb light. Blue-light treatment has been investigated for its effects on these molecules, while combined blue and red programmes have been studied for inflammatory acne. A controlled acne trial shows how researchers evaluate a specific treatment course and measure changes in acne. Choose a device with the appropriate Acne programme for that goal.
Acne is also influenced by blocked pores, oil production and inflammation. Describing it as a simple infection that a light permanently eradicates is incomplete. The treatment goal is improvement in the appropriate acne concern, with medical care when the condition is severe or scarring.
Why the same wavelength does not make two devices identical
Imagine two devices that list the same red wavelength. They may still differ in treatment area, delivered irradiance, pulse pattern, working distance and programme duration. They can therefore expose the skin differently even before individual biology is considered.
The optical properties of tissue also influence light distribution. Skin does not have a single, fixed penetration depth that applies to every person and every treatment. A neat colour chart can introduce the concept of different wavelengths, but it cannot tell you the exact dose reaching a joint, follicle or fibroblast.
From an interesting mechanism to a useful result
A laboratory study might measure a cellular signal. A human study might measure wrinkle appearance, acne lesions or hair density. Those are related levels of evidence, but they answer different questions. A compelling animation of mitochondria is not itself clinical proof.
For consumers, the useful question is whether a suitable device has evidence and an intended application that match the concern. For a deeper explanation of that distinction, read what photobiomodulation does during treatment.
How Celluma makes the choice practical
Celluma uses named programmes so you select the intended treatment rather than constructing a wavelength recipe. The available modes differ by model. Follow the relevant instructions for preparation, positioning, eye protection and the course.
If you want to see how the science translates into a routine, explore PRO II or ask Celluma Asia to demonstrate the programme for your concern. For reading specification sheets, continue to our wavelength and dose guide.
Frequently asked questions
What is a chromophore in plain language?
It is a molecule that absorbs light. Its absorption characteristics help determine how light interacts with tissue.
Is 640nm the only red wavelength that works?
No. Research uses several red and near-infrared wavelengths. The full device, exposure and application need to be evaluated together.
Are blue and red light doing the same thing?
They can have different biological targets and roles within a treatment. That is why acne programmes and wrinkle programmes should not be treated as interchangeable colours.
Does a mechanism explain my guaranteed result?
No. Mechanisms help explain biological possibilities; clinical studies and the model’s intended use guide treatment expectations for real people.
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