Red light and near-infrared light are two of the most commonly discussed wavelengths in LED skincare. They are often used together, they appear frequently in photobiomodulation research, and at first glance they can sound almost interchangeable.
They are not.
Red and near-infrared light occupy different parts of the light spectrum, have different wavelengths, and interact with tissue differently. Understanding those differences can make the technology behind an LED skincare routine much easier to understand.
This guide explains the difference between red and near-infrared light, what wavelengths such as 630 nm, 660 nm, 830 nm, and 850 nm mean, and what published research can — and cannot — tell us about their use in skincare.
First: What Does “nm” Mean?
When discussing LED skincare, you will often see numbers such as 630 nm, 660 nm, 830 nm, or 850 nm.
The abbreviation nm stands for nanometres. A nanometre is a unit used to describe the wavelength of light.
In simple terms, the wavelength tells us where that light sits within the electromagnetic spectrum.
Different wavelengths can have different optical and biological interactions with skin and tissue. This is one of the reasons wavelength matters when evaluating an LED skincare device.
Wavelength is not simply a color choice.
It is one of the technical parameters that defines the light being delivered.
What Is Red Light?
Red light is part of the visible-light spectrum, which means you can actually see it when the LEDs are illuminated.
In cosmetic photobiomodulation research, wavelengths around 630–660 nm have been investigated extensively.
Research has explored red LED exposure in relation to cosmetic measurements including wrinkles, skin texture, elasticity, fibroblast activity, and collagen-related changes.
For example, a randomized, placebo-controlled and split-face clinical study involving 76 participants investigated 633 nm red light, 830 nm near-infrared light, a combination of the two wavelengths, and sham treatment.
The researchers reported improvements in objectively measured wrinkles and elasticity in the active-treatment groups, along with histological observations involving collagen and elastic fibers.
A separate randomized, double-blind study involving 52 women evaluated 660 nm red LED light over 12 weeks and reported significant improvement in periocular wrinkle measurements compared with baseline.
View the 660 nm study on PubMed →
What Is Near-Infrared Light?
Near-infrared, usually shortened to NIR, sits just beyond visible red light on the electromagnetic spectrum.
Unlike visible red LEDs, near-infrared light itself is generally outside the range that the human eye can see.
That can sometimes confuse people using an LED device.
A near-infrared LED does not need to look intensely illuminated to be emitting near-infrared energy.
Near-infrared wavelengths commonly investigated in photobiomodulation research include ranges around 800–850 nm.
Compared with visible red wavelengths, near-infrared wavelengths generally have optical characteristics that allow greater transmission into deeper tissue. The exact penetration achieved in practice depends on wavelength, device output, tissue characteristics, treatment geometry, and other parameters.
Red Light vs. Near-Infrared Light: The Simple Difference
Red light: visible light commonly researched around 630–660 nm.
Near-infrared light: non-visible light commonly researched around 800–850 nm and generally capable of reaching deeper tissue layers.
That does not mean one wavelength is universally “better” than the other.
They are different tools within photobiomodulation, and researchers have investigated them individually as well as in combination.
Why Are Red and Near-Infrared Light Often Used Together?
One reason is that the two wavelength ranges can complement one another from an optical perspective.
Red wavelengths interact strongly with more superficial skin structures, while near-infrared wavelengths generally travel farther through tissue.
Researchers have therefore investigated combinations of red and near-infrared light rather than limiting photobiomodulation to one wavelength alone.
In one clinical study, 31 people with facial rhytids received nine treatments using a combination of 633 nm red and 830 nm near-infrared LED light.
At follow-up, researchers reported changes in objective skin-surface measurements, while 81% of participants reported improvement in periorbital wrinkles.
The researchers also noted that further work was needed to optimize treatment parameters.
View the 633 nm + 830 nm study on PubMed →
What Is Photobiomodulation?
Red and near-infrared LED skincare is often discussed within the broader field of photobiomodulation, or PBM.
Photobiomodulation involves exposing tissue to specific wavelengths of low-intensity light with the aim of influencing biological processes without relying on the tissue-damaging heat associated with ablative treatments.
One extensively discussed mechanism involves mitochondria — the structures within cells involved in cellular energy production.
Scientific reviews have proposed that red and near-infrared light can interact with mitochondrial chromophores, including cytochrome c oxidase, influencing cellular signalling and energy-related pathways.
The biology is more complicated than the simplified phrase “red light increases cellular energy,” however. Photobiomodulation can involve several interacting pathways, and its response depends strongly on treatment parameters.
Explore the photobiomodulation mechanism review on PubMed →
What Does the Research Say About Red Light for Facial Skin?
Red light has a comparatively substantial body of cosmetic-skin research behind it.
Studies have investigated wavelengths including approximately 630 nm, 633 nm, 660 nm, and 670 nm.
Outcomes examined across these studies have included:
- the appearance and measurement of facial wrinkles,
- skin texture,
- elasticity,
- collagen-related tissue changes,
- participant satisfaction, and
- tolerability.
A randomized clinical trial involving 137 women compared 660 nm red light with 590 nm amber light at the same light dose. Both protocols were associated with reductions in measured periocular wrinkle volume.
Importantly, not every skin measurement improved significantly. This is a useful reminder that a positive study does not mean a wavelength improves every possible characteristic of the skin.
View the randomized red-versus-amber study →
What Does the Research Say About Near-Infrared Light?
Near-infrared light is also well represented in photobiomodulation research, although research applications extend far beyond cosmetic skincare.
Within facial-rejuvenation research, 830 nm has been studied both alone and in combination with visible red wavelengths.
A major reason NIR attracts research interest is its greater tissue penetration compared with shorter visible wavelengths.
That does not mean that a higher wavelength automatically produces a better skincare result.
Wavelength is only one treatment variable.
Irradiance, fluence, treatment time, LED placement, treatment frequency, beam geometry, tissue characteristics, and device design can all influence the amount of light that ultimately reaches a biological target.
Do At-Home LED Masks Have Clinical Research?
Increasingly, yes — but the evidence should still be interpreted device by device.
Older photobiomodulation research often used professional LED systems rather than the flexible or wearable masks now common in home skincare.
More recent studies have begun evaluating actual home-use mask formats.
A 2025 multicenter, randomized, double-blind, sham-controlled study evaluated a home-use LED and infrared-emitting mask in 60 adults with crow's feet.
View the 2025 home-use LED/IRED mask study →
Another randomized, sham-controlled and double-blind clinical trial published in 2025 included 95 women and investigated a facial mask emitting 660 ± 10 nm red light at different weekly application frequencies.
View the 660 nm LED-mask study →
These studies are encouraging for the broader category, but they should not be interpreted as proof that every consumer LED mask will generate the same outcome.
Why Device Specifications Still Matter
Two masks can both advertise “red light” and still deliver substantially different treatments.
When comparing LED technology, wavelength is important — but it is not the only specification that matters.
Relevant variables can include:
- Wavelength — the spectral range emitted by the LEDs.
- Irradiance — the rate of light energy delivered to an area.
- Fluence — the total light dose delivered over the session.
- Session duration — how long the exposure lasts.
- LED positioning — distance and orientation relative to the skin.
- Coverage — how evenly the device distributes light across the face.
- Treatment frequency — how often sessions are performed.
A wavelength alone does not define an LED treatment.
The complete device and treatment protocol matter.
How Does LUMINO PRO Use Red and Near-Infrared Light?
LUMINO PRO includes multiple light modes rather than limiting the skincare ritual to one wavelength.
Its red-light options include 630 nm and 660 nm, while its near-infrared options include 830 nm and 850 nm.
The purpose of offering multiple wavelengths is not to suggest that one light is universally superior to another. Instead, the system gives users a broader range of light options within one skincare device.
You can explore all nine available modes on the KIYOSENSE Technology page.
Is 850 nm Better Than 830 nm?
Not necessarily.
It is tempting to look at wavelength numbers and assume that a larger number means stronger or better treatment.
That is not how photobiomodulation works.
Both 830 nm and 850 nm sit within the near-infrared region commonly investigated in photobiomodulation research.
Their practical effects depend on the entire treatment system, including output, dose, exposure time, geometry, and the biological target.
A difference of 20 nm should therefore not be interpreted as a simple “good versus better” ranking.
Is 660 nm Better Than 630 nm?
The same principle applies to visible red light.
Both approximately 630–633 nm and 660 nm have appeared in facial photobiomodulation research.
Clinical studies have reported positive cosmetic outcomes with wavelengths within both regions, but study designs and treatment parameters vary considerably.
Rather than asking which number is universally best, a more useful question is:
Is the wavelength being delivered as part of a thoughtfully designed and appropriately used LED system?
Can You See Near-Infrared LEDs Working?
Not in the same way you see red, blue, green, or yellow visible-light LEDs.
Near-infrared wavelengths used in skincare sit outside the normal visible spectrum. Depending on the hardware, you may sometimes notice a very faint visible component or see illumination through a camera sensor, but visible brightness is not a reliable way to judge near-infrared output.
In other words:
“I cannot see it” does not automatically mean “it is not operating.”
Which One Should You Choose: Red or Near-Infrared?
If your device provides both, you do not necessarily need to think of the decision as choosing one forever and rejecting the other.
Red and near-infrared wavelengths are often included together because they occupy complementary regions of the photobiomodulation spectrum.
The appropriate setting should be based on the device's intended modes and instructions, not on the assumption that one wavelength must always outperform another.
What the Research Does Not Prove
This distinction is important.
Published research on 633 nm, 660 nm, 830 nm, or other wavelengths does not mean that every device using the same wavelength has been clinically proven to produce the same result.
A clinical study evaluates a particular device, dose, treatment schedule, population, and protocol.
Consumer LED devices can differ in all of those respects.
Research should therefore be used to understand the scientific basis of the technology, rather than as a guarantee of an identical individual outcome.
The Simple Takeaway
Red light and near-infrared light are related, but they are not the same.
- Red light is visible and cosmetic PBM research commonly includes wavelengths around 630–660 nm.
- Near-infrared light sits beyond visible red and research commonly includes wavelengths around 800–850 nm.
- Near-infrared generally penetrates tissue more deeply than visible red wavelengths.
- Both wavelength regions have been investigated in photobiomodulation research.
- Red and NIR have also been studied in combination.
- Wavelength alone does not determine the quality or effectiveness of an LED device.
Different wavelengths. Different optical characteristics. One broader photobiomodulation spectrum.
That is why understanding LED skincare involves looking beyond the color you can see and considering the technology delivering the light.
To explore the complete LUMINO PRO wavelength system, visit The Technology Behind KIYOSENSE.
Research Referenced in This Guide
633 nm and 830 nm randomized facial rejuvenation study
Lee SY et al.
PubMed →
633 nm + 830 nm combination LED facial rejuvenation
Russell BA et al.
PubMed →
660 nm LED treatment of facial wrinkles
PubMed →
660 nm vs. 590 nm randomized photobiomodulation study
PubMed →
Home-use LED/IRED mask randomized clinical study
PubMed →
660 nm LED-mask application-frequency clinical trial
PubMed →
Photobiomodulation mechanisms and mitochondrial signalling
Hamblin MR.
PubMed →
Important: This article is provided for general skincare education and does not constitute medical advice. References to published studies describe the specific devices, wavelengths, treatment parameters, and populations used in those studies and should not be interpreted as a guarantee of identical results from LUMINO PRO or any other consumer LED device. Individual results may vary. Follow the instructions supplied with your device and consult an appropriate healthcare professional if you have a medical or dermatological condition or use photosensitizing medication.