Choosing an LED face mask can involve a lot of unfamiliar terminology — particularly when it comes to red light and near-infrared light. They are often used together in LED skincare devices, but they are not the same thing.
The main difference comes down to wavelength and how the light interacts with the skin.
If you're comparing LED masks or simply want to understand what those numbers measured in nanometres actually mean, here's a straightforward guide.
What is red light?
Red light is part of the visible light spectrum. In LED skincare, wavelengths around 630–660 nanometres (nm) are commonly used.
Because red light is visible, you'll see the characteristic red glow when a device is operating in this mode.
Red light has been widely studied in photobiomodulation research and is commonly incorporated into LED skincare routines focused on the appearance of the skin, including skin rejuvenation, texture and signs of ageing.
HebeHalo uses 630 nm red light as one of its four selected wavelengths.
What is near-infrared light?
Near-infrared, often shortened to NIR, sits just beyond the visible red portion of the light spectrum.
Unlike red light, near-infrared light is invisible to the human eye. This means you shouldn't expect to see the LEDs glowing brightly simply because an NIR mode is operating.
Near-infrared wavelengths used in LED devices are generally longer than visible red wavelengths and can penetrate more deeply into tissue. This is one reason red and near-infrared wavelengths are frequently studied and used together in photobiomodulation applications.
HebeHalo uses 850 nm near-infrared light.
Red light vs near-infrared: what's the difference?
Although they're closely related, the simplest way to distinguish them is:
Red light is visible and uses shorter wavelengths. Near-infrared light is invisible and uses longer wavelengths that can penetrate more deeply.
That doesn't necessarily make one "better" than the other. They have different characteristics, which is why you'll often find both included in LED light therapy devices.
When comparing masks, look at the actual wavelengths stated by the manufacturer, rather than relying only on descriptions such as "red light therapy" or the number of colours a device offers.
Why are red and near-infrared often used together?
LED devices don't necessarily have to choose between the two.
Red and near-infrared light are often paired because they allow a device to deliver light at different wavelengths within the same routine. This combination is commonly seen in photobiomodulation devices and increasingly in at-home LED skincare.
For shoppers, the important thing is knowing which wavelengths the device actually delivers.
A mask advertising several colours isn't automatically more advanced than one offering fewer. Wavelength, light output, coverage, device design and how realistically you'll use the mask are all worth considering.
What does 630 nm and 850 nm mean?
The nm simply stands for nanometres, the unit used to describe the wavelength of light.
With HebeHalo:
- 630 nm = red light
- 850 nm = near-infrared light
HebeHalo also includes 460 nm blue light and 590 nm amber light, giving the mask four selected wavelengths in total.
Each wavelength has different characteristics and has been studied for different applications within light-based skincare and photobiomodulation research.
Is near-infrared supposed to be invisible?
Yes.
This is an important point because it can initially seem as though an LED isn't working.
Near-infrared at 850 nm sits outside the range of light visible to the human eye, so you won't see it in the same way you see red, blue or amber light.
The absence of a visible glow does not, by itself, mean the near-infrared LEDs aren't operating.
Which should you look for in an LED face mask?
There isn't one wavelength that automatically makes a mask the right choice.
Instead, when comparing LED face masks, consider the device as a whole — including:
- the wavelengths it provides;
- LED coverage;
- intensity and controls;
- fit and comfort;
- session guidance;
- safety information; and
- whether the design is practical enough to use consistently.
Understanding the specifications makes it much easier to compare products based on what they actually provide rather than marketing language alone.
Where HebeHalo fits
The HebeHalo LED Light Therapy Mask combines 630 nm red light and 850 nm near-infrared light with 460 nm blue and 590 nm amber light.
Its flexible silicone design contains 240 LED beads, three adjustable intensity levels and a rechargeable controller, bringing four wavelengths together in one at-home device.
For us, LED skincare doesn't need to feel complicated. The goal is to give you clearly identified wavelengths and straightforward controls in a mask designed to fit into a real skincare routine.
Explore the HebeHalo LED Light Therapy Mask to see the full specifications and four wavelength options.