Research article

Understanding wavelengths and research

A plain-language guide to reading red and near-infrared light research with appropriate care.

This article discusses external research on LED technology. It does not describe studies of Hyala-specific devices.

How wavelengths are described

Published studies commonly describe light by wavelength in nanometres, alongside details such as irradiance, energy delivered, treatment schedule and body area. Those details help define what a study examined; they do not make findings interchangeable across devices or people.

Wavelengths in a cosmetic routine

For cosmetic use, wavelengths are best understood as different options for supporting the look of skin, rather than as treatments. Their optical reach varies by wavelength, but device output, dose, skin tone and tissue all affect how much light reaches each layer.

Blue: around 415 nm

Blue light is absorbed chiefly within the outer skin, particularly the epidermis. It is often chosen for routines focused on the appearance of clearer-looking, more balanced skin, especially when the complexion looks prone to visible blemishes or excess shine.

Red: around 630-633 nm

Red light can travel beyond the epidermis into the superficial dermis, the layer beneath it. It is a popular cosmetic choice for supporting a fresh-looking glow and the appearance of smooth, even-looking skin.

Near-infrared: around 830-850 nm

Invisible to the eye, this range can travel farther through the dermis than visible red light. It is commonly paired with red light in cosmetic devices for routines that aim to maintain skin that looks rested, supple and radiant.

Near-infrared: around 1072 nm

This higher near-infrared range may extend through the dermis and, depending on device settings and the area used, toward the fatty tissue below. It is used in some cosmetic devices for routines centred on maintaining a smooth, refreshed and well-rested-looking complexion.

These descriptions are cosmetic only. They are not intended to diagnose, treat, cure, prevent or relieve any condition.

What the literature examines

Photobiomodulation is an umbrella term used in published literature for studies involving particular wavelengths, light sources, doses and protocols. It is not a single treatment or a guarantee of any particular outcome.

Why device details matter

Research findings depend on study design and the exact intervention used. Wavelength, irradiance, energy delivered, treatment schedule, body area and participant population can all differ. Results from one protocol should not be assumed to apply to another device or to every person.

How we read the evidence

We distinguish between foundational reviews, condition-specific clinical studies and product-specific testing. The sources below provide context only; they do not establish that a Hyala product diagnoses, treats, cures, prevents or relieves any condition.

Questions worth asking

Look for the study population, device parameters, comparison group, follow-up period, adverse-event reporting and conflicts of interest. For personal medical questions or photosensitivity concerns, speak with a qualified healthcare professional.

Sources