Wondering if red light therapy is something for you? This guide breaks down the science behind red light therapy (RLT), its proven benefits, and practical steps to get started. From skin rejuvenation to pain management, discover how this innovative treatment is transforming health and wellness routines worldwide!

Disclaimer:
This guide is for informational purposes only and should not replace professional medical advice.

Table of contents

• What is Red Light Therapy?
• The History of Red Light Therapy
• The Science Behind Red Light Therapy
• Key Benefits and Applications
• Types of Red Light Therapy Devices
• General Treatment Guidelines
• Frequently Asked Questions
• References

what is red light therapy?

So, what Is Red Light Therapy (RLT)?

Red light therapy (RLT) uses specific wavelengths of red and near-infrared light. It triggers healing and regenerative processes in the body¹. This non-invasive treatment has gained significant popularity for its versatility and evidence-based benefits.

How Red Light Therapy Differs from Other Light Therapies

Unlike traditional light therapies or tanning beds, red light therapy doesn’t use harmful UV rays. Instead, it employs therapeutic wavelengths between 600-1000 nanometers that penetrate into your tissues, promoting cellular repair and regeneration².

This therapy therefore stands apart from other light treatments like:

• UV light therapy, as used for skin conditions
• Bright light therapy, as for seasonal affective disorder
• Infrared saunas (which primarily work through heat)

Light therapy can be tailored to specific skin conditions. While red light reduces inflammation and promotes healing, blue light for example is particularly effective against bacteria like P. acnes and is used to treat psoriasis.

The difference between RLT, LLLT and PBM

In the field of Red Light Therapy, you’ll also often encounter the terms Low-Level Light Therapy (LLLT) and Photobiomodulation (PBM). While these terms are all related, they each have their distinct meaning:

• Red Light Therapy (RLT) is the most specific term.
  It focuses exclusively on the use of visible red light (620-700nm) and near-infrared light (700-1000nm) for therapeutic purposes. This term is most commonly used in wellness and home-use contexts and it is the main focus of this article.
  
• Low-Level Light Therapy (LLLT) is a broader scientific term.
  LLLT encompasses therapeutic applications of various light wavelengths at low power densities. The key characteristic of LLLT is the use of low-power lasers or LEDs, distinguishing it from high-power medical laser treatments.
  
• Photobiomodulation (PBM) is the current preferred scientific term. It covers all therapeutic applications of light across the spectrum. It describes the fundamental biological mechanism of how light interacts with cells to create therapeutic effects.

Different Frequencies of Light Therapy

Both LLLT and PBM encompass a wide spectrum of light frequencies:

• Blue light (400-480nm) for treating acne and certain skin conditions³
• Green light (495-570nm) being studied for migraines and pain management⁴
• Red light (620-700nm) for skin rejuvenation and wound healing⁵
• Near-infrared light (700-1000nm) for deeper tissue penetration⁶

The History of red light therapy?

Historical Development

The history and terminology of red light therapy reveal an interesting evolution in the field. The first effects where discovered in 1967 by Endre Mester. He accidentally found that low-power laser light promoted hair growth and wound healing in rats.

Interestingly, one of the earliest discoveries of red light therapy’s benefits was its ability to stimulate hair regrowth, a finding that has since been supported by modern research. In our article on red light therapy for hair loss we discuss the science behind it.

The therapy was first known as Low-Level Laser (Light) Therapy (LLLT). While it started with lasers, researchers soon discovered that non-coherent (not-laser) LED lights could achieve similar beneficial effects. This discovery led to broader applications of the technology.

LLLT began as a somewhat controversial treatment, often dismissed as “snake oil” just a decade ago. However, in the meanwhile it has gained significant scientific recognition thanks to breakthrough research into its mechanisms of action.

Scientists identified that light affects the mitochondrial respiratory chain through cytochrome c oxidase. This explains how brief light exposure can create lasting effects in the body. This understanding has led to the adoption of the term “photobiomodulation” (PBM) as the current scientific standard. PBM reflects a broader understanding of how various wavelengths of light can modulate biological processes. PBM has emerged as a legitimate therapeutic tool with applications across numerous medical fields⁷.

the science behind RLT

How Does Red Light Therapy Work?

Several well-researched mechanisms explain how red light therapy affects your body at the cellular level:

• Mitochondrial Stimulation: When light particles (photons) are absorbed by the mitochondria in your cells, they trigger a series of biochemical reactions. This increases the production of ATP (cellular energy) and activates various cell-signaling pathways. Enhanced cellular energy means better cell function and faster repair processes⁸.
• Enhanced Blood Flow: Red light therapy stimulates the formation of new capillaries and dilates existing blood vessels. This improved microcirculation ensures better oxygen and nutrient delivery to your tissues while removing waste products more efficiently⁹.
• Collagen Production: The therapy activates fibroblasts, the cells responsible for collagen production. By stimulating these cells, RLT naturally increases collagen and elastin synthesis. This explains its powerful effects on skin health and wound healing¹⁰.
• Inflammation Reduction: RLT modulates inflammatory mediators and reduces oxidative stress in your cells. This helps manage chronic inflammation throughout the body, making it effective for various inflammatory conditions¹¹.

Together, these mechanisms contribute to a range of health benefits, from faster wound healing to pain relief.

Key Benefits & Applications

Red light therapy/RLT offers numerous advantages across various health and wellness domains. It has become a popular choice for improving skin health, alleviating pain, and boosting performance.

Skin Health & Rejuvenation

• Combat Aging: By reducing fine lines and wrinkles, it helps keep your skin looking youthful¹².
• Wound Healing Acceleration: It can also improve the healing rate of cuts, scrapes, and other skin injuries¹³.
• Boosting Circulation: This can help increase energy levels and promote general well-being¹⁴.
• Fight Hair Loss: Red light therapy stimulates hair growth by promoting cellular activity in hair follicles.
• Reduce cellulite: By stimulating collagen production and improving circulation, Red Light Therapy works well for cellulite.

Pain Management & Recovery

• Joint Pain Relief: It is particularly effective for alleviating joint discomfort¹⁵.
• Enhanced Muscle Recovery: Athletes often use it to speed up muscle healing after intense workouts¹⁶.
• Inflammation Control: The therapy’s anti-inflammatory effects are beneficial for managing chronic pain¹⁷.
• Post-Exercise Recovery: Using red light therapy after workouts can help reduce soreness and enhance recovery¹⁸.

Performance & Wellness

• Enhancing Athletic Performance: Many athletes use red light therapy to boost performance and endurance¹⁹.
• Improving Sleep Quality: There is evidence that it supports better sleep, which is essential for overall health²⁰.

Types Of Red Light Therapy Devices

Red light therapy devices come in various forms, designed for different treatment settings and needs. Whether for home use or professional application, understanding the options can help you choose the right device.

Home Devices for RLT

If you plan to use red light therapy at home, consider these common device types:

• LED Panels: Ideal for full-body treatments, LED panels can cover large areas in a single session. Explore LED Panels on Amazon.
• Handheld Devices: Great for targeting specific areas of the body, these devices offer flexibility in treating localized concerns. Browse Handheld Red Light Therapy Devices on Amazon.
• Light Therapy Belts: Designed for focused treatment. They are especially helpful for managing pain in areas like the back or joints. Shop Light Therapy Belts on Amazon.
• Red Light Beds: For professional-grade, full-body treatments, red light beds provide extensive coverage and high power output. Find Red Light Therapy Beds on Amazon.

Disclosure: As Amazon Associate, we earn from qualifying purchases.

Choosing the Right Device for RLT

Selecting the best red light therapy device requires considering several important factors. This helps ensure you get the most suitable and effective option.

1. Treatment Area Size
   Decide if you need a small device for targeted areas like the face or joints, or a larger panel for full-body exposure. Larger devices cover more skin at once, saving time. Smaller devices are portable and more budget-friendly.
2. Power Output (Irradiance)
   For superficial treatments, such as skin improvement and anti-aging applications, a power density (irradiance) of 20-100 mW/cm² is typically used. When deeper cellular penetration is desired, such as for muscle and tissue treatment, a higher irradiance exceeding 100 mW/cm² usually is recommended. Therapy’s usually don’t go higher than 200 mw/cm².
3. Wavelength Specificity
   Red light therapy typically uses wavelengths between 630-660 nm (red light) and 810-850 nm (near-infrared light). Red light works well for surface-level skin treatments. Near-infrared light penetrates deeper, benefiting muscles and joints. Some devices offer a mix of wavelengths for more versatility²¹.
4. Safety Features and Certifications
   Ensure the device is tested for safety. Features like automatic shut-off timers and heat management can also enhance user safety.
5. Certification
   Certifications such as FDA clearance (in the U.S.), CE marking (in Europe), and IEC 60601-1 for medical devices indicate that the device meets basic safety standards. This means it has been tested for electromagnetic safety, stability, and resistance to damage.
6. Portability and Ease of Use
   If you plan to travel or prefer something easy to set up, consider the size, weight, and mounting options. Handheld devices are portable. Mounted panels allow for hands-free use.

General Treatment GUIDELINES

*Disclaimer: This guide is for informational purposes only and should not replace professional medical advice. Always consult with your healthcare provider before starting red light therapy, particularly if you have any existing medical conditions or are pregnant or nursing.

General Treatment Guidelines

1. Position your device at the recommended distance. Be precise and consistent in keeping the same distance!
2. Start with short sessions to test skin response. Gradually increase duration based on the guidance, your comfort and results.
3. Maintain a consistent treatment schedule for the best results.
4. Document your progress with photos or notes. See what works well for you!
5. For optimal timing for recovery and performance, explore our article on pre- and post-workout red light therapy.

Frequently Asked Questions

Q: How often should I use red light therapy?

Daily use is usually recommended for optimal results, with sessions often lasting around 10-20 minutes. However, the ideal frequency can vary depending on the specific treatment area and condition being targeted.

Q: Is red light therapy safe?

Yes, when used according to the guidelines. It is a non-invasive treatment with minimal side effects.

Q: How long until I see results?

The timeline varies depending on the condition being treated. For skin improvements, expect to see changes within 4-12 weeks. Pain relief may be felt almost immediately or within a few weeks.

Q: Can I combine red light therapy with other treatments?

Yes, it usually can complement other therapies. Consult your healthcare provider for tailored advice.

Q: What are the differences between RLT, LLLT, and PBM?

Red light therapy (RLT), low-level laser therapy (LLLT), and photobiomodulation (PBM) are related treatments. They all use light to stimulate biological processes. RLT typically employs red or near-infrared light, while LLLT can use various wavelengths, including laser light. PBM is a broader term encompassing both,. PBM refers to the therapeutic use of light to enhance cellular function, reduce inflammation, and promote healing.

Q: What’s the best time for treatment?

Consistency matters more than timing. Choose a schedule that works for your routine and stick to it.

Q: What’s the difference between lasers and LEDs in light therapy?

Initially, photobiomodulation (PBM, “light therapy”) relied heavily on lasers, especially in the 1960s when laser technology was first introduced. Lasers were favored for their precise, coherent, and high-intensity beams, which were thought to be essential for effective therapy. However, more recent studies show that light-emitting diodes (LEDs) can offer similar benefits²².

Q. Why are LEDs popular for PBM today?

LEDs have become increasingly common for PBM due to several advantages:

• Safety: LEDs do not require the same safety measures as lasers.
• Ease of Use: They’re suitable for home use and often come in wearable formats.
• Coverage: LEDs can irradiate larger tissue areas at once.
• Cost: They’re significantly more affordable per milliwatt compared to lasers.

References

1. Avci, P., et al. (2013). Low-level laser (light) therapy (LLLT) in skin: stimulating, healing, restoring. Seminars in Cutaneous Medicine and Surgery, 32(1), 41-52. [link] ↩︎
2. Hamblin, M. R. (2018). Mechanisms and applications of the anti-inflammatory effects of photobiomodulation. AIMS Biophysics, 5(3), 181-201. [link] ↩︎
3. Ash C, et al. (2015)”A randomized controlled study for the treatment of acne vulgaris using high-intensity 414 nm solid state diode arrays” J  Cosmet Laser Ther:,(4):170-6. [link] ↩︎
4. Noseda R, Bernstein CA, et al. (2016) “Migraine photophobia originating in cone-driven retinal pathways.” Brain. 139(7):1971-86 [link] ↩︎
5. Wunsch A, Matuschka K. “A Controlled Trial to Determine the Efficacy of Red and Near-Infrared Light Treatment in Patient Satisfaction, Reduction of Fine Lines, Wrinkles, Skin Roughness, and Intradermal Collagen Density Increase.” Photomed Laser Surg. 2014 Feb 1;32(2):93-100. [link] ↩︎
6. Hamblin MR, Demidova TN. “Mechanisms of low level light therapy.” Proc. SPIE 6140, Mechanisms for Low-Light Therapy, 614001 (2006) [link] ↩︎
7. Hamblin, M. R. (2016). Photobiomodulation or low-level laser therapy. Journal of Biophotonics, 9(11-12), 1122-1124. [link] ↩︎
8. Ferraresi, C., et al. (2012). Low-level laser (light) therapy increases mitochondrial membrane potential and ATP synthesis in C2C12 myotubes with a peak response at 3-6 hours. Photochemistry and Photobiology, 88(6), 1577-1584. [link] ↩︎
9. Ihsan, F. R. (2005). Low-level laser therapy accelerates collateral circulation and enhances microcirculation. Photomedicine and Laser Surgery, 23(3), 289-294.[link] ↩︎
10. Avci, P., et al. (2013). Low-level laser (light) therapy (LLLT) in skin: stimulating, healing, restoring. Seminars in Cutaneous Medicine and Surgery, 32(1), 41-52. [link] ↩︎
11. de Freitas, L. F., & Hamblin, M. R. (2016). Proposed Mechanisms of Photobiomodulation or Low-Level Light Therapy. IEEE Journal of Selected Topics in Quantum Electronics, 22(3). [link] ↩︎
12. Wunsch, A., & Matuschka, K. (2014). A Controlled Trial to Determine the Efficacy of Red and Near-Infrared Light Treatment in Patient Satisfaction, Reduction of Fine Lines, Wrinkles, Skin Roughness, and Intradermal Collagen Density Increase. Photomedicine and Laser Surgery, 32(2), 93-100. [link] ↩︎
13. Gupta, A., et al. (2014). Effect of red and near-infrared wavelengths on low-level laser (light) therapy-induced healing of partial-thickness dermal abrasion in mice. Lasers in Medical Science, 29(1), 257-265. [link] ↩︎
14. Ihsan, F. R. (2005). Low-level laser therapy accelerates collateral circulation and enhances microcirculation. Photomedicine and Laser Surgery, 23(3), 289-294.[link] ↩︎
15. Stelian, S., et al. (1992). Improvement of Pain and Disability in Elderly Patients with Degenerative Osteoarthritis of the Knee Treated with Narrow-Band Light Therapy. Journal of the American Geriatrics Society. [link] ↩︎
16. Borsa, P. A., et al. (2013). Does phototherapy enhance skeletal muscle contractile function and postexercise recovery? A systematic review. Journal of Athletic Training, 48(1), 57-67. [link] ↩︎
17. de Freitas, L. F., & Hamblin, M. R. (2016). Proposed Mechanisms of Photobiomodulation or Low-Level Light Therapy. IEEE Journal of Selected Topics in Quantum Electronics, 22(3). [link] ↩︎
18. Foley, J., et al (2016). 830 nm light-emitting diode (led) phototherapy significantly reduced return-to-play in injured university athletes: a pilot study. Laser Therapy  doi: 10.5978/islsm.16-OR-03 [link] ↩︎
19. Avci, P., et al. (2013). Low-level laser (light) therapy (LLLT) in skin: stimulating, healing, restoring. Seminars in Cutaneous Medicine and Surgery, 32(1), 41-52. [link]  ↩︎
20. Zhao, J., et al. (2012). Red light and the sleep quality and endurance performance of Chinese female basketball players. Journal of Athletic Training, 47(6), 673-678. [link] ↩︎
21. Gupta, A., et al. (2014). Effect of red and near-infrared wavelengths on low-level laser (light) therapy-induced healing of partial-thickness dermal abrasion in mice. Lasers in Medical Science, 29(1), 257-265. [link] ↩︎
22. Heiskanen & Hamblin (2018). Photobiomodulation: Lasers vs Light Emitting Diodes?, Photochem Photobiol Sci [link] ↩︎

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Last Updated: October 2024