LED light therapy for the face - effects, research and treatment | Nordic Skin College

LED light therapy has moved from niche treatment to a staple on many clinics’ treatment menus in just a few years. The technology is not new - NASA originally developed it to promote wound healing in space - but it is only in the past decade that research has documented its skin-rejuvenating effects thoroughly enough for it to become a serious clinical treatment.

At Nordic Skin College we teach LED therapy as part of our device-based treatments, and we use it daily in the student clinic. Here is a professional overview of what light therapy can do, who it is for, and what you can realistically expect from a treatment course.

What is LED light therapy?

LED stands for Light Emitting Diode. Unlike laser, which focuses light into a single beam with high intensity, LED panels spread light over a larger area at lower energy. This makes the treatment painless, non-invasive and with no downtime.

The principle is photomodulation: light waves at specific frequencies penetrate the skin and influence cellular processes. Different wavelengths (measured in nanometres) reach different depths and trigger different biological responses.

It is important to understand that LED therapy is not a quick fix. It is a cumulative treatment where results build over time - typically across 6-12 sessions.

The three most important wavelengths

Red light - 630 nm

Red light with a wavelength around 630 nanometres penetrates 2-3 mm into the skin and reaches the dermis, where collagen production takes place.

What the research shows: A frequently cited study published in Photomedicine and Laser Surgery showed a significant improvement in the skin’s collagen density and reduction of fine lines after 30 treatments over 9 weeks. Participants also reported improved skin texture and firmness.

Who benefits:

• Skin showing early signs of ageing (fine lines, loss of elasticity)
• Sun-damaged skin
• Post-inflammatory hyperpigmentation
• Skin that needs healing after chemical peels or microneedling

Red light is the most versatile wavelength and the one most widely used in anti-ageing contexts.

Blue light - 415 nm

Blue light penetrates only 1-2 mm into the skin, but has a specific and well-documented effect: it kills Cutibacterium acnes (formerly called Propionibacterium acnes), the bacterium that plays a central role in inflammatory acne.

What the research shows: Blue light activates porphyrins - photosensitive molecules produced naturally by C. acnes bacteria. When the porphyrins absorb blue light, they generate free radicals that destroy the bacterium’s cell membrane. Several clinical studies have shown a 40-70% reduction in inflammatory acne lesions after 4-8 weeks of treatment.

Who benefits:

• Mild to moderate inflammatory acne
• Acne that does not respond sufficiently to topical products
• Clients who want to avoid or supplement antibiotic treatment
• Oily skin prone to breakouts

Blue light is often used in combination with red light, as the red light reduces inflammation and promotes healing of the damage caused by acne.

Near-infrared light (NIR) - 830 nm

NIR light is invisible to the naked eye and penetrates deepest - up to 5 mm into the tissue. It reaches subcutaneous fat tissue and deeper structures.

What the research shows: NIR stimulates the mitochondria (the cells’ energy factories) to produce more ATP, which accelerates cellular repair and regeneration. Studies have demonstrated anti-inflammatory effects, improved lymphatic drainage and increased microcirculation.

Who benefits:

• Chronic skin inflammation (rosacea, eczema)
• Post-operative healing
• Swelling and oedema
• Deep tissue damage
• Combination with other treatments to boost results

Treatment protocol - what to expect

A typical course

A professional LED treatment course typically looks like this:

• Intensive phase: 2-3 treatments per week for 4-6 weeks (8-12 sessions total)
• Maintenance phase: 1 treatment every 2-4 weeks
• Session duration: 15-30 minutes under the panel (depending on the indication)

Most clients notice an improvement in the skin’s radiance and texture after 4-6 sessions. Collagen building and anti-ageing effects take longer and typically become visible after 8-12 sessions.

What happens during the treatment

You lie relaxed with eye protection while the LED panel is placed close above the face. You feel a gentle warmth, but no pain. Many clients fall asleep during the treatment. Afterwards the skin is typically slightly pink for 10-30 minutes, but there is no real downtime.

Combinations that boost the effect

LED therapy works particularly well as a finishing step after other treatments:

• After a chemical peel: NIR reduces inflammation and accelerates healing
• After microneedling: Red light boosts the collagen response
• As part of acne treatment: Blue light supplements extraction and deep cleansing
• After a facial: Red/NIR enhances the absorption of active ingredients

Home devices vs. professional treatment

The market for home LED devices has exploded. There are masks, panels and handheld units at every price point. But are they effective?

The difference in brief

Professional equipment:

• High irradiance (light intensity measured in mW/cm2) - typically 50-100 mW/cm2
• Uniform illumination across the entire treatment area
• Precise, calibrated wavelengths
• Medical certification

Home devices:

• Lower irradiance - typically 5-30 mW/cm2
• Smaller treatment area
• Varying quality in wavelength precision
• No requirement for clinical documentation of efficacy

Our recommendation

Home devices in the higher price range (from approx. DKK 3,000) can work as maintenance between professional treatments. But they do not replace clinical treatment - they supplement it.

If you invest in a home device, look for:

• Specific indication of wavelength in nm (not just “red light”)
• Irradiance stated in mW/cm2
• FDA clearance or equivalent CE marking
• Clinical studies that specifically test the product in question

Avoid cheap LED masks under DKK 500. They rarely have sufficient light intensity to produce a biological effect.

Who should avoid LED light therapy?

LED is generally a very safe treatment form, but there are some contraindications:

• Active use of photosensitising medication (certain antibiotics, retinoic acid derivatives at high doses)
• Epilepsy (certain frequencies can trigger seizures)
• Active skin cancer in the treatment area
• Pregnancy (as a precaution, although no harmful effects have been demonstrated)

Your therapist should always conduct a thorough medical history before starting. That is one of the reasons professional treatment is preferable to unsupervised home use.

LED therapy and the future

Research is moving fast. Newer studies are investigating combinations of wavelengths pulsed in specific patterns, individualised protocols based on skin type and genetics, and synergies with specific active ingredients.

LED therapy is not a miracle treatment, and it does not replace chemical peels, injectables or laser. But as a non-invasive, painless supplement with solid scientific documentation, it has earned its place as a permanent part of the modern treatment arsenal.

LED light therapy at Nordic Skin College

In our student clinic we offer LED light therapy as a standalone treatment and as an add-on to facials. Our students are trained in correct wavelength selection, contraindications and protocol adaptation - because effective LED therapy is about more than just switching on a panel.

LED light therapy is included as an optional add-on in several of our facial treatments, including our luxury facial with back massage and light therapy, and can be added as a light therapy add-on to any treatment. Book an appointment at our student clinic and experience the difference. Want to learn to work with LED therapy yourself? See our specialist course in light therapy or the full cosmetology and skin therapy programme.