7-Color LED Light Therapy Chart: What Each Color Does and How to Choose the Right Wavelength

Different LED light therapy colors are designed for different purposes, but the specific wavelength — not just the color itself — is what determines how the light interacts with the body. Red, near-infrared, and blue light are the most extensively studied wavelengths, while a growing body of research suggests green and yellow light may also support specific skin and wellness concerns. Purple and cyan light are sometimes included in multi-color LED devices, although research on these colors as distinct therapies is more limited.

If you're comparing LED devices, don't assume that more colors automatically mean better results. The effectiveness of LED light therapy depends on factors such as the wavelengths used, the amount of light delivered, and how consistently the treatment is used. Understanding what each color is designed to do and how much evidence supports its use can help you choose the right treatment for your specific goals.

7-Color LED Light Therapy Chart

The chart below compares the most common LED light therapy colors, their wavelengths, how deeply they penetrate the skin, the concerns they are most commonly used for, and the strength of scientific evidence. The colors are listed from most studied to least studied based on the current body of published research. 

*A note about research strength: The star ratings reflect the overall strength and quantity of published research supporting each LED light therapy color or wavelength for its most commonly studied applications. They are intended as a general guide to the current evidence, not a measure of how effective one color is compared with another.

The light therapy color shouldn’t be the only thing you evaluate when looking for a device. It’s important to understand the specifications too. Two devices may both advertise “red light therapy” but have vastly different performance. One may use 630 nm LEDs while another uses 660 nm LEDs, and they may deliver different power levels. Although both appear red to the eye, they can interact with tissue differently. Likewise, near-infrared light isn’t visible, but it’s one of the most extensively studied therapeutic wavelengths and is commonly paired with red light in high-quality LED therapy devices.

What Does Each LED Light Color Do?

LED light therapy uses specific wavelengths of visible and near-infrared light to stimulate biological processes without exposing the skin to ultraviolet (UV) radiation. Although treatments are commonly described by color, it's the wavelength of light, measured in nanometers (nm), that influences how it interacts with biological tissues. Because each wavelength has been studied for specific therapeutic applications, understanding these distinctions can help you choose the most appropriate treatment for your goals.

1. Red Light

Red light is one of the most extensively studied wavelengths in LED light therapy and is best known for supporting skin rejuvenation, anti-aging, collagen production, wound healing, and healthy inflammatory responses. Most therapeutic devices use wavelengths between 600 nm and 660 nm, which penetrate into the dermis where collagen, elastin, and fibroblasts are found.

Like other therapeutic wavelengths used in LED light therapy, red light works through photobiomodulation, a process that stimulates light-sensitive molecules within cells to support ATP production and normal cellular repair. A 2020 review of photobiomodulation research found that red light can stimulate cell proliferation and tissue repair by increasing cellular energy production and influencing key biological pathways involved in healing. Another comprehensive 2024 review concluded that red light may support skin rejuvenation by promoting type I and III collagen and elastin remodeling while also supporting every phase of wound healing and helping regulate inflammation.

2. Near-Infrared (NIR) Light

Near-infrared (NIR) light is also an extensively studied therapeutic wavelength and is best known for supporting deeper tissues that visible light cannot easily reach. Unlike red light, which primarily targets the skin, NIR wavelengths (typically 800–870 nm) penetrate beyond the dermis into muscles, joints, tendons, and other soft tissues.

Because of its greater penetration depth, NIR is commonly used to support recovery, healthy inflammatory responses, circulation, and wound healing. A 2020 review of photobiomodulation research found that near-infrared light can penetrate more deeply into biological tissues than visible red light, allowing it to influence muscles, tendons, nerves, and other deeper structures. The review also highlighted its role in supporting tissue repair and cellular energy production. A separate review on the anti-inflammatory effects of photobiomodulation concluded that red and near-infrared light may help regulate inflammatory pathways, reduce oxidative stress, and support tissue healing, helping explain why NIR has been widely studied for recovery and musculoskeletal applications.

3. Blue Light

Blue light therapy is best known for treating acne because it targets acne-causing bacteria on the skin’s surface. Most devices use wavelengths between 415 nm and 465 nm, which primarily affect the epidermis rather than deeper layers of tissue.

Blue light’s primary benefit comes from its antimicrobial effects. A comprehensive review of blue light in dermatology concluded that it is one of the most well-established light-based treatments for acne because it helps reduce Cutibacterium acnes, the bacteria associated with acne breakouts, while also helping regulate inflammation. A more recent review of photobiomodulation research continues to support blue light’s role in acne management, particularly when used as part of a broader skincare routine.

Beyond skincare, blue light has also been studied for oral health applications. One laboratory study found that specific blue light wavelengths inhibited the growth of Porphyromonas gingivalis, a key bacterium associated with periodontal disease, highlighting its potential to support oral hygiene when combined with good dental care.

4. Green Light

Green light therapy has shown promise for both improving skin tone and supporting certain pain-related conditions, although the research is still developing. Most devices use wavelengths between 525 nm and 570 nm, which penetrate the epidermis and upper dermis.

Early research suggests green light may benefit both skin health and pain management. A 2023 laboratory study found that low-energy green light reduced oxidative stress and other markers associated with photoaging, suggesting it may help support a more even complexion and healthier-looking skin. Beyond skincare, two preliminary clinical trials found that regular green light exposure reduced migraine frequency and improved pain and quality of life in people with fibromyalgia. While these findings are encouraging, larger human studies are still needed to better understand green light’s long-term effectiveness and ideal treatment protocols.

5. Yellow Light

Yellow light therapy is commonly used to support sensitive or aging skin and has shown promising early results for improving visible signs of photoaging. Most therapeutic devices use wavelengths between 575 nm and 590 nm, which primarily target the upper dermis.

Early research suggests yellow light may benefit skin health in several ways. A laboratory study found that 590 nm yellow light reduced oxidative stress and helped protect dermal fibroblasts from UVB-induced damage, suggesting it may help support healthier-looking skin. More recently, a randomized controlled clinical trial found that a treatment protocol combining 570/590 nm yellow light with red and near-infrared light improved wrinkles, skin texture, and brown spots in people with facial photoaging. Because the clinical study evaluated yellow light as part of a multi-wavelength treatment, additional research is still needed to better understand yellow light’s independent effects.

6. Purple Light

Purple light is not a unique wavelength. It combines red and blue light to deliver the benefits of both in a single treatment. Rather than producing its own distinct biological effects, purple light is designed to pair blue light’s antimicrobial properties with red light’s skin-rejuvenating and anti-inflammatory effects.

Unlike red, blue, or near-infrared light, there are currently no high-quality clinical studies evaluating purple light as a standalone therapy. Instead, its proposed benefits are based on the well-established research supporting its individual components. Because red light has been extensively studied for skin rejuvenation and wound healing and blue light has been widely studied for acne and antimicrobial effects, manufacturers often combine the two wavelengths in LED face masks and other multi-color devices to address multiple skin concerns during the same treatment.

7. Cyan Light

Cyan light is one of the least studied LED light therapy colors, and its proposed benefits are based largely on manufacturer claims rather than robust clinical research. It typically falls between blue and green light on the visible spectrum, using wavelengths around 470 nm to 520 nm.

One clinical study found that 470 nm LED phototherapy used in combination with red light significantly improved moderate-to-severe acne vulgaris, suggesting that wavelengths at the blue-cyan boundary may have antimicrobial benefits. However, there are very limited high-quality clinical studies evaluating cyan light as a standalone therapy, and many of its proposed benefits, such as calming the skin or improving overall skin appearance, are based on manufacturer claims rather than robust clinical evidence. More research is needed to determine whether cyan light offers distinct therapeutic effects beyond those already demonstrated for adjacent blue and green wavelengths.

How to Choose the Right LED Light Color

The best LED light therapy color depends on your primary treatment goal. While some devices offer multiple colors, you don’t necessarily need every wavelength. Choosing the one with the strongest research for your specific concern is often more important than selecting a device with the greatest number of color options.

*What about purple light? Purple light isn’t included as a primary recommendation because it typically combines red and blue wavelengths rather than representing its own therapeutic wavelength. If you’re considering purple light, it’s best suited for acne-prone skin when you want to combine the acne-fighting benefits of blue light with the skin-rejuvenating and post-breakout support of red light.

Keep in mind that wavelength is just one factor that determines how effective LED light therapy may be. Device quality, irradiance (light intensity), treatment time, and consistency all influence results. A device with fewer clinically studied wavelengths may provide better outcomes than one that simply offers more color options.

If you’re unsure where to start, red light and near-infrared light are generally the best all-around choices because they have the strongest body of research and support a wide range of skin and wellness applications. Blue light is the preferred choice for acne, while green and yellow light may be worth considering if your primary concerns are pigmentation, redness, or sensitive skin.

Can You Combine Different LED Light Colors?

Yes, many LED light therapy colors can be used together, and certain combinations may provide complementary benefits. Rather than competing with one another, different wavelengths target different cells and tissues, making them useful for addressing multiple concerns during the same treatment plan.

Some of the most common combinations include:

Not every LED device includes multiple wavelengths, and more colors don’t necessarily mean better results. A device with one or two clinically studied wavelengths may be more effective than a device with numerous treatment modes but lower-quality specifications. Factors such as wavelength accuracy, irradiance, treatment time, and consistency have a much greater impact on results than simply the number of colors offered.

When choosing a device, focus on the wavelengths that best match your treatment goals. If you want to address multiple concerns, look for combinations that are supported by research rather than assuming every color provides unique or additive benefits.

Should You Use LED Light Therapy Colors in a Specific Order?

There isn’t a universally recommended order for using LED light therapy colors. Current research focuses much more on choosing the right wavelength, using an appropriate treatment dose, and following a consistent routine than on applying colors in a specific sequence.

If your device offers multiple treatment modes, start with the color that best matches your primary concern. For example, someone treating acne may prioritize blue light, while someone focused on wrinkles or skin rejuvenation may spend more time using red light. If your goal is muscle recovery or joint support, near-infrared light is often the better choice because it penetrates more deeply into the body.

Many modern LED devices either combine multiple wavelengths into a single treatment or allow you to switch between treatment modes. In these cases, follow the manufacturer’s recommended treatment protocol rather than worrying about using the colors in a particular order.

Ultimately, consistency is far more important than sequence. Regular treatments with clinically studied wavelengths are likely to have a greater impact on your results than the order in which different colors are applied.

What to Look for in an LED Light Therapy Device

The best LED light therapy device is the one that delivers clinically studied wavelengths at appropriate treatment parameters for your specific goals. 

As you compare devices, here are the most important features to look for:

• Clinically studied wavelengths: Look for devices that disclose their wavelengths in nanometers (nm) rather than simply advertising colors. For example, 660 nm red light and 850 nm near-infrared light are among the most extensively studied therapeutic wavelengths.

• Appropriate irradiance (mW/cm²): Irradiance measures how much light energy reaches the treatment area. A device with appropriate irradiance can deliver an effective dose in a reasonable treatment time.

• The right device for your needs: Different device types are designed for different treatment areas. For example, LED face masks are ideal for facial concerns, light pads work well for larger body areas, targeted lasers are suited for smaller treatment areas, and oral light therapy devices are designed specifically for gum and oral health.

• Treatment area and LED coverage: Consider the size of the area you want to treat. Larger devices can cover more surface area at once, while smaller devices may be better for targeted applications.

• Safety and transparency: Choose manufacturers that clearly disclose their specifications, provide treatment guidelines, and are transparent about testing, warranties, and customer support. If a device is FDA-cleared for its intended use, that’s another positive indicator of quality.

• Realistic claims: Be cautious of devices that promise instant results or claim every color offers the same level of benefit. The strongest evidence currently supports red, near-infrared, and blue light, while research on other wavelengths continues to evolve.

Finding the Best LED Light Therapy Color for Your Goals

Choosing the right LED light therapy color starts with understanding your treatment goals and the wavelengths behind each color. While red, near-infrared, and blue light have the strongest body of research for applications such as skin rejuvenation, recovery, and acne, green and yellow light continue to show promising results for concerns like pigmentation, sensitive skin, photoaging, and certain pain conditions.

As you compare devices, remember that wavelength, irradiance, and overall device quality matter far more than simply offering the most colors. A well-designed device that uses clinically studied wavelengths is more likely to deliver consistent results than one that relies on marketing claims or an extensive list of treatment modes.

Whether you’re looking to reduce wrinkles, clear acne, improve your skin tone, support muscle recovery, or promote overall wellness, Novaalab offers a range of LED light therapy devices designed around clinically studied wavelengths for targeted, at-home treatments. From the Glow Therapy Mask for facial skincare to the Light Pad, Extra-Strength Healing Laser, Light Switch, and Oral Care Pro, you can choose a device that aligns with your specific goals and treatment area.