Red and near-infrared light treatments are often grouped together, but they use different wavelengths. Understanding that distinction helps explain why the device, treatment settings, and intended purpose matter.
Light therapy is not one interchangeable treatment. A device studied for facial wrinkles should not automatically be expected to treat pain, hair loss, or a medical skin condition.
What is red light?
Red light is part of the visible spectrum, approximately 620–750 nanometers in wavelength. Treatment devices use selected wavelengths within or near this range.
Certain red-light protocols have been studied for improving the appearance of fine lines and supporting skin repair. Results depend on more than the color of the light: the amount of energy delivered, treatment duration, and consistency of use also matter.
What is near-infrared light?
Near-infrared light lies just beyond visible red light. Definitions vary somewhat by field, but it generally begins around 750–780 nanometers and extends to approximately 1,400 nanometers.
It is not visible to the human eye and generally penetrates tissue more deeply than visible red light. However, deeper penetration does not automatically mean a better treatment for every concern.
The appropriate wavelength and dose depend on the tissue and intended outcome.
How does photobiomodulation work?
Photobiomodulation uses selected light exposures to influence biological activity without intentionally burning or removing tissue.
Researchers have investigated effects on cellular signaling, mitochondrial activity, inflammation, and repair. These mechanisms help explain the interest in treatment, but laboratory findings should not be presented as guaranteed clinical benefits.
What can it do for skin?
Some devices and protocols have evidence supporting modest improvement in the appearance of fine lines and wrinkles. Light therapy may also have a supporting role in selected treatment plans.
It does not replace sunscreen, remove excess skin, or reproduce the effects of filler or ablative resurfacing. Improvement typically requires consistent treatment rather than one session.
Is this the same as blue-light acne treatment?
No. Blue light has different properties and is used in some acne-treatment devices because of its effects on acne-associated bacteria.
Some systems combine blue and red light. That does not mean red or near-infrared light alone has the same antibacterial mechanism or that every device is appropriate for acne.
Choosing and using a device
Look for evidence and regulatory clearance relevant to the exact device and concern. Follow its instructions for treatment duration, frequency, positioning, and eye protection.
Discuss suitability if you take photosensitizing medication, have a photosensitive condition, or have melasma or pigmentation that worsens with warmth. Do not assume every device is suitable immediately after a procedure.
At Modern Aesthetics in San Jose, red light therapy is considered as part of an individualized skin plan. Schedule a consultation to discuss whether it has a useful role alongside your skincare or other treatments.
Updated October 23, 2026.