The Ultimate Guide to LED Therapy Colors (Uses & Benefits)

LED light therapy uses specific wavelengths of visible and invisible light to trigger biological processes in the body – from killing acne bacteria to boosting collagen, easing pain, improving mood, and regulating sleep.

Each light therapy color works differently.

Some target bacteria. Others reduce inflammation. Some stimulate collagen. Others regulate your circadian rhythm.

There is growing evidence that LED light therapy colors can play a crucial role in treating chronic pain, skin conditions and skin aging, sleep disorders, anxiety and depression, and even hair loss and fat reduction.

In this guide, you’ll find all the LED light therapy colors, how they differ, their best uses, and how to use them at home.

Light Therapy Colors: The Complete Guide

What do light therapy colors do?

Here’s a quick breakdown:

• Blue light (450-495 nm) – Kills acne bacteria
• Red light (610-700 nm) – Boosts collagen & reduces inflammation
• Near-infrared (750-1400 nm) – Deep tissue repair & pain relief
• Green light (515-570 nm) – Hyperpigmentation & migraines
• Yellow/Amber (570-620 nm) – Redness & skin soothing
• White light (10,000 lux) – Seasonal depression & sleep regulation

The best color depends entirely on your goal.

Light therapy, usually emitted through LED bulbs, uses various wavelengths that correspond to different visible colors.

Each color penetrates the skin at different depths and affects the body tissues differently.

The most common colors of LED light therapy are red and blue, but there are quite a few more that also have great benefits (medical and cosmetic), backed by scientific research for decades.

The other colors include yellow, green, purple, cyan, white, and near-infrared.

Different light colors will penetrate the skin to different depths, so the color you need is most dependent on the condition or problem you are trying to treat.

Using a combination of lights can give you more benefits and is better from a holistic approach.

Blue Light Therapy for Acne

• Wavelength – 450 – 495 nanometers

Blue light therapy is safe and effective in reducing acne lesions.

It is shown in clinical studies to reduce acne-causing bacteria (Cutibacterium acnes).

For example, a study published in the Journal of Cosmetic and Laser Therapy showed that daily self-treatment using a blue light device for mild-to-moderate inflammatory acne significantly reduced the number of acne lesions.

Based on clinical studies and my testing of many at-home devices, it is best to combine it with red light therapy to promote faster skin healing and prevent acne scars.

Blue Light Therapy Devices

If you’re treating mild breakouts on the face, a handheld device gives you precision control.

If you struggle with persistent acne on larger areas like the back or chest, a panel or mask saves time and ensures consistent coverage.

• For targeted facial acne, the LightStim for Acne is FDA-cleared and designed specifically for inflammatory breakouts.
• For full-face treatment with red and blue combination, the dpl IIa allows hands-free sessions.

Plus, you just have to sit in front of it effortlessly, compared with handheld devices requiring manual work.

👉 See my full dpl IIa review to decide if it’s worth the price for acne and anti-aging.

Red Light Therapy for Anti-Aging, Wound Healing, and Pain Relief

• Wavelength – 610 – 700 nanometers

RED low-level wavelengths of light can treat skin issues such as wrinkles, scars, and persistent wounds.

Red light therapy is best for skin rejuvenation and wound healing because it stimulates collagen production, increases fibroblast production, increases blood circulation to the tissue, and reduces cell inflammation.

👉 Here’s exactly how to use red light therapy for wounds (with correct timing and distance).

It is thought to work by acting on the mitochondria in the cells, which generate energy in the cells.

With more energy, other cells can do their work more efficiently, such as repairing skin, boosting new cell growth, and promoting skin rejuvenation.

A 2018 review examined several controlled trials on red light and wound healing.

The researchers determined that red light therapy significantly increased tensile strength and wound contraction, for faster, more effective healing results across the body.

Though less effective than infrared light therapy, red light therapy is also widely used for pain relief, especially in tissues closer to the skin.

It is also used to treat hair loss and thinning, with proven results.

👉 See how to use red light therapy for hair loss!

Red Light Therapy Devices

To treat skin conditions such as wrinkles, scars, and eczema, you can use a red LED wand, a red light therapy panel, and an LED face mask.

For wound healing, the best devices are a red light therapy torch (for spot healing) or a small red light therapy panel.

For pain relief, the best devices are red light therapy wraps and large LED light therapy panels.

👉 Compare the most effective red light devices side-by-side before you buy.

Green Light Therapy for Hyperpigmentation and Sleep Problems

• Wavelength – 515 to 570 nanometers

Green light therapy is effective in treating several conditions, including pain, migraines, and hyperpigmentation.

It can reduce melanin production in the skin, which is responsible for hyperpigmentation, and improve skin tone.

Dr. Muller, a renowned manufacturer of innovative devices for the professional beauty market, has found an 80% improvement in pigmentation among patients using green light therapy.

Does green light therapy help migraines?

Some research shows that green light exposure can reduce migraine frequency and intensity in some people.

Small clinical studies have found that low-intensity green light may:

• Decrease headache days
• Reduce pain severity
• Be better than white, blue, or red light during migraines

Green Light Therapy Devices

You can find the green wavelength in multi-color LED light therapy masks (such as the Project E Beauty LED mask), and some green light therapy lamps (such as the highly related Hooga Green Light Therapy Lamp)

Yellow (Amber) Light Therapy for Redness, Inflammation, and Mental Health

• Wavelength – 570 to 620 nanometers

Yellow light is best known for skin cell rejuvenation and its soothing anti-inflammatory benefits, and it boosts lymphatic flow, which removes toxins and waste.

It stimulates the production of red blood cells, which play a vital role in skin healing and skin cell rejuvenation, and it is also known to have a positive effect on mental health, helping people to be positive, stable, active, and focused.

Clinical studies have shown that yellow LED light therapy can improve outcomes in skin conditions such as acne vulgaris, post-inflammatory hyperpigmentation, and rosacea.

👉 See how LED light therapy is used in rosacea protocols (and what to avoid).

Yellow Light Therapy Devices

You can find yellow/amber light therapy mainly in some LED light therapy devices and some LED light therapy masks. The most budget-friendly pick is a yellow light therapy bulb.

Purple light therapy – Combines the Benefits of Blue and Red light therapy

• Wavelength – 380 to 450 nanometers

Most devices labeled as “purple light” actually use red and blue LEDs at the same time.

The benefits come from combining antibacterial blue light with collagen-stimulating red light – not from a unique purple wavelength.

The purple light can eliminate acne-causing bacteria while stimulating the production of elastin and collagen.

Purple Light Therapy Devices

You can find purple light therapy inside the Lightstim for Acne device and the Lumalux Face+ Pro LED mask (my personal favorite).

Cyan Light Therapy for Reducing Swelling and Inflammation

• Wavelength – 470 to 500 nanometers

Cyan light therapy (also known as blue-green light therapy) is used as a gentle acne treatment to control oil production in the skin as well as reduce inflammation.

While there are limited specific studies on cyan light therapy, you can expect the combined benefits of blue and green light therapy mentioned above.

Cyan Light Therapy Devices

If you’re looking for a multi-color mask that includes cyan, the Lumalux Face+ Pro Mask includes this setting.

Near-Infrared Light Therapy for Deep Penetrating Healing and Pain Relief

• Wavelength – 0.75 to 1.4 micrometers (µm)

Near-infrared (NIR) light therapy is a type of treatment that uses light in the red to near-infrared wavelengths (invisible to the human eye) to promote healing and reduce inflammation in the body.

It can penetrate significantly deeper than visible red light, reaching muscles and joints depending on wavelength and tissue density.

NIR light therapy (also known as low-level laser therapy) stimulates the mitochondria in cells, responsible for producing energy.

This increased energy production can help cells repair themselves and become healthier.

It can also increase blood flow and reduce inflammation, which can help promote healing.

Near-infrared light therapy is generally considered safe when used properly, though people with light sensitivity or certain medical conditions should consult a healthcare professional.

Near Infrared Light Therapy Devices

Near and far infrared devices are in high demand and widely used, and you can find many types of devices you can use at home.

These include near infrared lamps, LED light therapy pads, LED wands, LED panels, near infrared saunas, infrared sauna blankets, and more.

👉 Want a low-cost setup? Here’s how to build a near-infrared sauna at home.

👉 Or compare the best infrared therapy devices for pain relief here.

White Light Therapy

• Ideal LUX Intensity – 10,000

White light therapy, also known as bright light therapy or phototherapy, is a treatment that mimics natural outdoor light and is proven to improve mental health and regulate sleep.

White light is a combination of all visible light wavelengths, ranging from approximately 380 to 800 nanometers.

Bright light therapy devices are measured by LUX – the light intensity or illuminance: it indicates how bright a light source is.

The higher the Lux value, the brighter the lamp.

Bright light therapy at 10,000 lux is widely recommended by clinicians as a first-line treatment for seasonal affective disorder (SAD).

Studies have shown that 2500 lux light is effective in treating chronic depression, bipolar disorder, ADHD, insomnia, dementia, and PMS.

White Light Therapy Devices

To use bright light therapy at home, you can choose from light therapy lamps, light therapy boxes (usually larger and brighter), and dawn simulators.

If you want clinical-level brightness at home, this is one of the most studied 10,000 lux lamps available.

It is a larger, high-intensity lamp that provides 10,000 lux of light and has a broad surface area for optimal light exposure.

For best results, sit 16–24 inches away for 20–30 minutes in the morning.

How Does LED Light Therapy Work?

LED light therapy works by emitting specific wavelengths of light that are absorbed by cells in the body.

The exact mechanism is thought to involve the production of ATP (adenosine triphosphate) – the main energy source for cells in your body.

When cells absorb light, they produce ATP, which can then be used for different cellular processes.

This increased ATP production has been shown to promote repair, healing, skin rejuvenation, pain reduction, and improvements in mood, brain health, and even immune system functioning.

The skin-rejuvenating effects of LED light therapy are produced by a mechanism known as photobiomodulation, which is a non-thermal process that involves exciting cells and tissues.

It can be used to treat various skin conditions, such as acne, fine lines, eczema, psoriasis, and chronic wounds.

Dr. Michael Hamblin, PhD, associate professor at Harvard Medical School, has conducted dozens of studies on the health benefits of infrared light therapy, including brain disorders, sports injuries, chemotherapy side effects, Alzheimer’s, cancer, and more.

Which Light Therapy Color Should You Choose?

• If you have acne – Blue & Red
• If you want anti-aging – Red
• If you have joint pain – Near-infrared
• If you have seasonal depression – White light
• If you have hyperpigmentation – Green

When in doubt, a red and near-infrared combination device offers the largest range of scientifically supported benefits.

Is Blue Light Therapy Safe Long-Term?

Blue light therapy used for acne is generally considered safe when used according to device instructions.

Clinical studies on at-home blue LED devices have not shown serious long-term side effects when used the right way. However:

• Blue light mostly acts on the skin surface.
• Overuse or too much intensity may cause temporary dryness or irritation.
• Eye protection is recommended during treatment.

Unlike ultraviolet (UV) light, therapeutic blue LED light does not have the same skin cancer risks. Still, it should not be confused with high-intensity blue light exposure from screens.

Beyond Color: How Strong Does the Light Have to Be?

To this day, there is no agreement about the parameters and protocols for medical and cosmetic applications.

In 2018, Dr. Hamblin tried to resolve all the contradicting results of studies – some of them recommending a power density of less than 100 mW/cm2 and an energy density of 4 to 10 J/cm2, and others recommending as much as 50 J/cm2.

Interestingly, he found that cells/tissues with high numbers of mitochondria tended to respond to lower doses of light than those with a lower number of mitochondria.

Light therapy follows something called a biphasic dose response.

Too little light does nothing. Too much can reduce effectiveness. The right dose matters more than the color alone.

Mitochondria generate most of the chemical energy needed to power the cell’s biochemical reactions.

It is highest in muscle, liver, skin, and brain cells and lower in red blood cells and Epithelial cells.

This means that a power density of 100 mW/cm2 and an energy density of 4 to 10 J/cm2 is optimal for treating skin conditions and muscle/nerve injuries.

Safety Precautions for LED Light Therapy

Most at-home color light therapy treatments are safe for everyone and cause no long-term side effects if you use the devices properly.

The first rule is to always follow the manufacturer’s instructions for the specific device.

Next, it’s better to choose a device that is FDA-cleared.

Eye protection (I have the Mito Red Light Therapy Glasses) is recommended for most color light therapy treatments.

Lastly, do not use color light therapy if you are taking medication that increases your sensitivity to light (such as isotretinoin and lithium).

Before buying any device, always confirm:

• Wavelength is clearly listed
• Power output is specified
• Treatment distance is explained

Conclusion

Light therapy colors are not interchangeable. Each wavelength interacts differently with your tissue, with bacteria, inflammation processes, and cellular energy production.

Choosing the right color – and the right dose — is what makes the difference between marketing hype and real biological results.

To your health and happiness,

Meital

Studies

Ablon G. Phototherapy with Light Emitting Diodes: Treating a Broad Range of Medical and Aesthetic Conditions in Dermatology. J Clin Aesthet Dermatol. 2018 Feb;11(2):21-27. Epub 2018 Feb 1. PMID: 29552272; PMCID: PMC5843358.

Campbell PD, Miller AM, Woesner ME. Bright Light Therapy: Seasonal Affective Disorder and Beyond. Einstein J Biol Med. 2017;32:E13-E25. PMID: 31528147; PMCID: PMC6746555.

Fargason RE, Fobian AD, Hablitz LM, Paul JR, White BA, Cropsey KL, Gamble KL. Correcting delayed circadian phase with bright light therapy predicts improvement in ADHD symptoms: A pilot study. J Psychiatr Res. 2017 Aug;91:105-110. doi: 10.1016/j.jpsychires.2017.03.004. Epub 2017 Mar 6. PMID: 28327443; PMCID: PMC7959333.

Martin LF, Patwardhan AM, Jain SV, Salloum MM, Freeman J, Khanna R, Gannala P, Goel V, Jones-MacFarland FN, Killgore WD, Porreca F, Ibrahim MM. Evaluation of green light exposure on headache frequency and quality of life in migraine patients: A preliminary one-way cross-over clinical trial. Cephalalgia. 2021 Feb;41(2):135-147. doi: 10.1177/0333102420956711. Epub 2020 Sep 9. PMID: 32903062; PMCID: PMC8034831.