How deep does Light Therapy Reach and what does each wavelength of blue, green, yellow, red, and near infrared do?

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Let’s take a closer look at how therapeutic light therapies work, their benefits, and the specific wavelengths involved. We’ll dive into blue, yellow, red, and near-infrared light therapies, discussing their uses, the depth they penetrate into the skin, and what makes them so effective.

Blue Light Therapy

Wavelength: 415 nm

Blue light therapy primarily uses blue wavelengths around 415 nanometers (nm). This specific wavelength is highly effective at targeting the bacteria responsible for acne and offers several other benefits.

Uses and Benefits

Acne Treatment
- How it works: Blue light penetrates the skin to a depth of about 0.5 mm. It targets Propionibacterium acnes, the bacteria that cause acne. The blue light induces a photochemical reaction, producing reactive oxygen species that kill the bacteria and reduce inflammation.
- Evidence: Research published in the Journal of Clinical and Aesthetic Dermatology shows that blue light therapy significantly reduces acne lesions and is a safe treatment for mild to moderate acne.
Neonatal Jaundice
- How it works: For newborns with jaundice, blue light helps break down excess bilirubin in the blood. The light converts bilirubin into a water-soluble form that can be easily excreted by the baby’s body.
- Evidence: The American Academy of Pediatrics states that blue light therapy is a standard and effective treatment for neonatal jaundice, preventing severe complications and ensuring safer bilirubin levels.
Skin Conditions
- How it works: Blue light also helps with skin conditions like psoriasis and eczema by reducing inflammation. It penetrates the upper layers of the skin, aiding in the reduction of redness and swelling.
- Evidence: Studies in Photodermatology, Photoimmunology & Photomedicine suggest that blue light therapy can effectively reduce inflammation and improve symptoms in various skin conditions.

Yellow Light Therapy

Wavelength: 570-590 nm

Yellow light therapy uses wavelengths between 570 and 590 nm. This range is particularly beneficial for improving skin health and mood, penetrating the skin to a moderate depth.

Uses and Benefits

Skin Rejuvenation
- How it works: Yellow light penetrates the skin to a depth of about 1-2 mm. It stimulates collagen production, improves skin elasticity, and helps reduce redness and sun damage.
- Evidence: The Journal of Cosmetic and Laser Therapy reported that yellow light therapy can enhance skin hydration, reduce wrinkles, and improve overall skin texture.
Mood Enhancement
- How it works: Yellow light can positively influence mood by affecting the body's circadian rhythms and serotonin production. It’s often used to treat mood disorders like Seasonal Affective Disorder (SAD).
- Evidence: Research published in Behavioral and Brain Functions indicates that yellow light therapy can improve mood and reduce symptoms of depression, particularly in those with SAD.
Wound Healing
- How it works: Yellow light therapy promotes wound healing by boosting blood circulation and lymphatic flow, aiding in faster tissue repair and reducing inflammation.
- Evidence: Studies in Lasers in Medical Science have shown that yellow light therapy can significantly enhance wound healing and reduce inflammation, making it a valuable tool for treating injuries and surgical wounds.

Red Light Therapy

Wavelength: 600-700 nm

Red light therapy, also known as low-level laser therapy (LLLT) or photobiomodulation, uses red light in the range of 600-700 nm. This type of light penetrates deeper into the skin compared to blue and yellow light.

Uses and Benefits

Wound Healing
- How it works: Red light penetrates the skin to a depth of about 5-10 mm, stimulating cellular activity and promoting tissue repair. It increases blood flow to the treated area, enhancing the delivery of oxygen and nutrients.
- Evidence: The Journal of the American Academy of Dermatology found that red light therapy significantly speeds up the healing process of wounds and reduces scarring.
Pain and Inflammation
- How it works: Red light therapy reduces pain and inflammation by decreasing oxidative stress and improving circulation in the affected tissues.
- Evidence: Research in Pain Research and Management shows that RLT is effective in reducing pain and inflammation in conditions like arthritis and muscle injuries.
Skin Rejuvenation
- How it works: Red light stimulates collagen production and improves skin elasticity, reducing wrinkles and promoting a youthful appearance.
- Evidence: A study published in Seminars in Cutaneous Medicine and Surgery confirmed that red light therapy improves skin texture, reduces wrinkles, and enhances overall skin tone.

Near-Infrared Light Therapy

Wavelength: 700-1200 nm

Near-infrared (NIR) light therapy uses wavelengths from 700 to 1200 nm. This light penetrates even deeper into the body, making it effective for treating muscles, joints, and deeper tissues.

Uses and Benefits

Muscle Recovery and Pain Relief
- How it works: NIR light can penetrate the skin to depths of 20-50 mm, reaching muscles and joints. It promotes cellular repair and reduces inflammation, enhancing blood flow and speeding up muscle recovery and pain relief.
- Evidence: A study in the American Journal of Physical Medicine & Rehabilitation found that NIR therapy significantly reduces muscle soreness and speeds up recovery after intense physical activity.
Neurological Benefits
- How it works: NIR light can penetrate the skull and potentially benefit brain health. It’s being studied for its potential to improve cognitive function and treat conditions like traumatic brain injury and neurodegenerative diseases.
- Evidence: Research in Frontiers in Neuroscience suggests that NIR light therapy can improve brain function, reduce neuroinflammation, and promote recovery after brain injuries.
Wound Healing and Tissue Repair
- How it works: NIR light stimulates cellular activity and promotes the repair and regeneration of damaged tissues. It’s effective in treating chronic wounds and injuries.
- Evidence: A study in Photomedicine and Laser Surgery found that NIR therapy significantly enhances wound healing and tissue repair, making it a valuable tool in medical treatments.

Safety and Usage Tips

Light therapy is generally safe, but here are some tips to ensure you use it correctly:

Consult a Professional: Before starting any light therapy, consult with a healthcare professional to ensure it’s appropriate for your condition.
Protect Your Eyes: Some types of light therapy, especially blue light, can be harmful to the eyes. Always use protective eyewear if recommended.
Follow Guidelines: Use the therapy device according to the manufacturer’s instructions or your healthcare provider’s guidance to avoid overexposure.

References

Journal of Clinical and Aesthetic Dermatology: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3339127/
American Academy of Pediatrics: https://pediatrics.aappublications.org/content/128/4/e1046
Photodermatology, Photoimmunology & Photomedicine: https://onlinelibrary.wiley.com/doi/abs/10.1111/phpp.12558
Journal of Cosmetic and Laser Therapy: https://www.tandfonline.com/doi/abs/10.1080/14764170902785029
Behavioral and Brain Functions: https://bmcneurosci.biomedcentral.com/articles/10.1186/s12993-015-0077-5
Lasers in Medical Science: https://link.springer.com/article/10.1007/s10103-015-1760-1
Journal of the American Academy of Dermatology: https://www.jaad.org/article/S0190-9622(11)00110-8/fulltext
Pain Research and Management: https://www.hindawi.com/journals/prm/2020/1253623/
Seminars in Cutaneous Medicine and Surgery: https://www.s-chem.org/article/S1064-3745(12)00242-1/fulltext
American Journal of Physical Medicine & Rehabilitation: https://journals.lww.com/ajpmr/Abstract/2006/03000/Effect_of_Near_Infrared_Light_on_Delayed_Onset.2.aspx
Frontiers in Neuroscience: https://www.frontiersin.org/articles/10.3389/fnins.2019.01239/full
Photomedicine and Laser Surgery: https://www.liebertpub.com/doi/10.1089/pho.2019.4772

Do not buy Red Light Therapy Wands - a Clinical Reality Check

Small handheld red light wands are advertised everywhere across social media. Companies claim that waving a tiny, battery-operated stick over your skin for three minutes will lift wrinkles, clear acne, and firm your face. The honest answer is grounded in biophysics: handheld red light wands do not possess the power density, coverage area, or energy output required to trigger cellular repair.

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Red Light Therapy and Perimenopause

Red Light Therapy for Perimenopause: A Supportive Guide to Naturally Easing Symptoms Perimenopause is a natural transition, but the physical and emotional shifts can feel overwhelming. Up to 80% of women notice significant changes during this stage, which can begin years before periods stop completely. Hormone replacement therapy and dietary adjustments are popular options, but red light therapy has become a popular, non-invasive home tool to help support hormonal balance, skin health, and everyday energy. What Is Perimenopause? Perimenopause is the multi-year transition leading up to menopause. During this window, your ovaries gradually slow down hormone production, but hormone levels do not decline in a straight line. Instead, they spike and plunge unpredictably. Key facts about the perimenopause transition: Timeline: It usually begins in your 40s (sometimes late 30s) and typically lasts between 4 and 8 years. Hormonal swings: Estrogen levels fluctuate erratically while progesterone steadily drops. The official marker: You remain in perimenopause until you have gone 12 consecutive months without a menstrual cycle. At that point, you have reached menopause. Common symptoms: Irregular cycles, sleep disruptions, sudden temperature changes, mood shifts, brain fog, vaginal dryness, and joint aches. How Does Red Light Therapy Work? Red light therapy - also known as photobiomodulation or low-level light therapy - uses specific wavelengths of visible red light (around 660 nm) and invisible near-infrared light (around 850 nm). Natural sunlight provides these same restorative wavelengths at sunrise and sunset without harmful ultraviolet (UV) radiation. Here is how these wavelengths interact with your body at a cellular level: Boosts cellular energy: Red and near-infrared light penetrate your skin to reach the mitochondria (the powerhouses of your cells). This light stimulates the production of adenosine triphosphate (ATP), giving your cells the fuel they need to repair and regenerate. Improves blood flow: Light therapy prompts your blood vessels to release nitric oxide. This naturally dilates vessels, improves circulation, and delivers fresh oxygen and nutrients to tissues. Lowers inflammation: Near-infrared wavelengths penetrate deep into tissues and joints to calm swelling and reduce oxidative stress. Supports mood chemicals: Exposure to therapeutic light encourages the release of beta-endorphins, which help soothe physical discomfort and lift mood. How Red Light Therapy Supports Perimenopause Symptoms Because perimenopause affects many bodily systems at once, red light therapy helps address multiple symptoms simultaneously without medication side effects. 1. Easing Hot Flashes and Night Sweats Hot flashes are triggered when shifting estrogen levels confuse the hypothalamus - the temperature regulation center in the brain. Light therapy supports the central nervous system and helps stabilize daily circadian rhythms. Regular red light sessions can calm stress responses and reduce the frequency or intensity of sudden hot flashes. Recommended device: For full-body systemic balance, explore the Kivo Red Light Therapy Panels. 2. Restoring Deep, Restful Sleep Nearly half of all women in perimenopause report trouble falling or staying asleep due to night sweats, racing thoughts, or progesterone drops. Unlike daytime blue light from phones and televisions, red light signals to your brain that it is time to rest. Evening red light exposure helps your body produce melatonin naturally, making it easier to drift into deep sleep without morning grogginess. Recommended device: Use a bedside panel like the Kivo ONE Series for 10 to 15 minutes while winding down at night. 3. Improving Skin Elasticity, Dryness, and Hormonal Breakouts Falling estrogen slows down collagen synthesis, leading to thinner skin, fine lines, and sudden dryness. At the same time, hormonal imbalances can trigger unexpected adult breakouts. Red light triggers fibroblasts in the dermis to produce fresh collagen and elastin, restoring skin firmness. Near-infrared light calms redness, irritation, and dryness. Certain multi-wavelength devices also provide blue light to clear acne-causing bacteria. Recommended device: The hands-free Kivo Elite LED Face Mask delivers targeted facial rejuvenation in comfortable 10-minute sessions. 4. Supporting Hair Density and Scalp Health Many women notice excess hair shedding or thinning along their parting line during perimenopause. Red light penetrates the scalp to revitalize dormant hair follicles. It increases local blood supply, ensuring follicles receive the nutrients needed to produce thicker, stronger hair strands. Recommended device: The wearable Kivo Elite LED Red Light Therapy Cap provides focused scalp coverage while you read or relax. 5. Soothing Stiff Joints and Muscle Aches Estrogen protects joints and tendons from inflammation. When levels fluctuate and fall, joint stiffness and body aches frequently appear. Near-infrared wavelengths travel deep into muscles, ligaments, and cartilage. Increased circulation clears waste products and delivers repairing nutrients to inflamed joints. Recommended device: For targeted relief on knees, shoulders, hands, or feet, the portable Kivo Vital MINI lets you focus light exactly where you hurt. Step-by-Step Instructions: How to Start at Home Adding red light therapy to your daily wellness routine is straightforward. Here is a step-by-step approach to get the best results: Step 1: Set up your space. Place your device on a table, use a floor stand, or put on your wearable mask/cap in a comfortable, quiet room. Step 2: Cleanse the treatment area. Remove heavy makeup, sunscreens, or thick lotions so light can penetrate your skin effectively. Step 3: Protect your eyes. While red light is safe, high-powered panels are bright. Wear the provided eye protection goggles during your session. Step 4: Keep the proper distance. Sit or stand 6 to 12 inches away from light panels. Wearable masks and caps sit directly against your skin. Step 5: Time your session. Start with 10 minutes per treatment area. Consistency is key - aim for 3 to 5 sessions per week. Step 6: Follow with your standard skincare. Apply your favorite hydrating serums and moisturizers immediately after your session, as skin absorbs topicals well following light therapy. Safety and What to Expect No UV radiation: Red light devices do not use UV rays, meaning there is zero risk of sunburn or skin damage. No downtime: Treatments produce a gentle, soothing warmth and require no recovery period. Non-invasive: It offers a gentle complementary option alongside your existing perimenopause self-care plan. Helpful References Hode, T., et al. "The Use of Low-Level Laser Therapy (LLLT) For Musculoskeletal Pain." PMC, 2015. Liebert, Ann D., et al. "Comparative Effectiveness of Low-Level Laser Therapy for Adult Androgenetic Alopecia." PMC, 2010. "Menopause and Sleep." National Sleep Foundation, 2021. Sotogarcia, L. "The Effects of Red Light Therapy on Joint Pain and Stiffness." California State University, 2018. "Perimenopause: Signs, Symptoms, and Management." The North American Menopause Society.

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how long should you use red light therapy for

How Long Should I Do Light Therapy For?

How Long Should I Do Light Therapy For? If you recently got a light therapy panel, mask, or flashlight - or if you are looking into getting one for skin care or muscle recovery - you probably have one big question on your mind: How long should each session actually last? It is easy to think that sitting in front of a light for an hour will give you four times the benefits of a 15-minute session. Light therapy does not work that way. Your cells have a sweet spot for how much light energy they can take in at one time. Here is a straightforward guide to help you set the right timers for your sessions based on the exact wavelengths used in Kivo Light Therapy devices. The Core Rule: Why More Light Is Not Always Better Light therapy works through a scientific rule called the biphasic dose response. That sounds technical, but the idea is simple: Too little light: Your cells do not get enough energy to trigger changes. The right amount of light: Your cells get energized, speeding up repair and collagen production. Too much light: Your cells get full, lose their boost, and temporarily stop responding. Think of it like charging a smartphone. Once your battery hits 100%, leaving it on the charger for another five hours will not give you extra battery life. Keeping your sessions within the recommended time window gives you the best results without wasting time. Session Times by Light Wavelength & Goal Different light wavelengths reach different depths in your tissue. Here is how long you should run each specific light mode. 1. Blue Light Therapy (480nm Wavelength) What it targets: Skin surface, acne-causing bacteria, and oil balance. Ideal session length: 3 to 5 minutes per area (up to 10 minutes maximum for a full face treatment). Distance from skin: 3 to 6 inches (10 to 15 cm). Best time of day: Morning or early afternoon (before 1-2 pm). Blue light is fantastic for clearing up surface spots and keeping skin clean. Because blue light mimics bright daylight, it tells your brain that it is time to wake up. Using blue light late in the evening can mess with your body clock and make it harder to fall asleep at night. If you are using a portable option like the Kivo Pro Flashlight on small spots, 5 minutes per spot is plenty. If you are using a multi-light panel like the Kivo ONE Pro Panel, set the timer for 10 minutes on your face. 2. Red Light Therapy (630nm and 660nm Wavelengths) What it targets: Skin health, collagen production, reducing redness, and soothing surface inflammation. Ideal session length: Face treatments: 10 minutes. Body areas (shoulders, arms, back): 10 to 15 minutes. Distance from skin: 3 to 6 inches (10 to 15 cm). Best time of day: Any time before 6 pm. Red light reaches the outer layers of your skin to help rebuild collagen and keep your skin tone balanced. A quick 10-minute session on your face with a device like the Kivo Elite Face Mask or a panel from the Kivo ONE Series is enough to give your skin cells a solid energy bump. 3. Near-Infrared Light Therapy (810nm, 830nm, 850nm, and 940nm Wavelengths) What it targets: Deeper muscle tissue, joints, tendons, and post-workout recovery. Ideal session length: 10 to 15 minutes per target area. Distance from skin: 3 to 6 inches (10 to 15 cm). Best time of day: Before 6 pm. Near-infrared (NIR) light is invisible to the human eye, but it travels deeper into your body than red or blue light. It reaches sored muscles and stiff joints to lower soreness after workouts or sports. Because NIR light goes deeper, your tissue benefits from a slightly longer session of 10 to 15 minutes per zone. Larger setups like the Kivo THREE Series or the full-body Kivo TWELVE Series allow you to cover larger areas of your body in one single 10 to 15 minute run. 4. Scalp Care (660nm Red and 850nm Near-Infrared) What it targets: Scalp circulation and hair follicle health. Ideal session length: 10 minutes per session. Frequency: 3 to 4 times per week. For hair and scalp health, consistency matters more than long individual sessions. A dedicated device like the Kivo LED Light Therapy Cap uses dual-chip LEDs to deliver red and near-infrared light right to the hair roots in an easy 10-minute automated routine. Step-by-Step Instructions for Your Light Routine To get clean, predictable results every time, follow these steps during your regular sessions: Step 1: Clean your skin. Wash off makeup, sunscreen, or heavy lotions before starting. Clean, bare skin lets the light penetrate without reflections. Step 2: Put on eye protection. Put on dark protective goggles (like the eye guards included with Kivo panels) when treating your face or working near your eyes. Step 3: Check your distance. Position yourself 3 to 6 inches (10 to 15 cm) away from the panel or device. Step 4: Select your light mode. Use Blue Light in the morning for acne or surface skin care. Use Red + Near-Infrared Light for general skin glow, joint relief, or muscle recovery. Step 5: Set your timer. Keep face treatments between 3 and 5 minutes. Keep muscle or joint treatments between 10 and 15 minutes. Step 6: Finish with your standard skin routine. Apply your usual moisturizer or serum after your session is finished. Quick Reference Cheatsheet Light Color / Type Target Wavelengths Recommended Time Target Area Best Time of Day Blue Light 480nm 3 - 5 minutes Facial skin, spots, breakouts Morning to 2:00 PM Red Light 630nm, 660nm 5 - 10 minutes Face, chest, skin tone Morning or afternoon (before 6:00 PM) Near-Infrared (NIR) 810nm, 830nm, 850nm, 940nm 10 - 15 minutes Muscles, joints, deep repair Before 6:00 PM Scalp Care 660nm + 850nm 10 minutes Scalp and hair roots Any time during the day Common Mistakes to Watch Out For Sitting too close or too far: Sitting 2 feet away makes the light too weak to be effective. Pressing up against a high-power panel can make the area uncomfortably warm. Stick to the 3-to-6 inch range. Using blue light at night: Blue light tricks your brain into thinking it is noon. Stick to morning use for blue light so your evening sleep signals stay normal. Overdoing it out of impatience: Doing three 20-minute sessions in one day will not speed up your skin progress. Stick to 3 to 5 regular sessions per week. Skipping eye protection: Light panels are very bright. Always use protective goggles during facial treatments. Simple Summary for Getting Started Keep face treatments between 5 and 10 minutes. Keep body and muscle treatments between 15 and 20 minutes. Stay 3 to 6 inches away from your panel during treatment. Repeat your routine 3 to 5 days a week. Focus on consistency over duration... short regular sessions beat long random ones every time!

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September 7, 2026

Do not buy Red Light Therapy Wands - a Clinical Reality Check

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September 7, 2026

Red Light Therapy and Perimenopause

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August 9, 2026

How Long Should I Do Light Therapy For?

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BEWARE of cheap Red Light

Red light therapy has grown rapidly in popularity, and for good reason. It supports cellular health, speeds up muscle recovery, and keeps skin looking fresh. But as demand builds, a serious problem has appeared online. The market is flooded with dirt-cheap panels that look fine on the outside but are completely hollow, ineffective, or even harmful on the inside.

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Red Light Therapy for Pets

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Red Light Therapy for Migraines and Headaches

Migraine sufferers often search for non-invasive solutions that avoid the side effects associated with traditional pharmaceutical treatments. Red and Near-Infrared light are gaining recognition as evidence-based tools for long-term migraine prevention and management.

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Red Light Therapy Dosage Calculator

Getting the right dosage of Light Therapy is crucial to obtaining the results you're looking for. Our exclusive algorithm takes into account the outcomes of thousands of customers, feedback, as well as the results of numerous scientific studies, we've built a red light therapy dosage calculator that takes in the irradiance of a device, the distance you want to use it, whether you're changing brightness / pulse modes / treatment type, and takes all of that into account to calculate the correct dosage you need. Red Light Dosage Calculator

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Red Light & Near-Infrared Therapy for Concussions & Head Injury Recovery

Red and near-infrared light therapy—also known as photobiomodulation—is emerging as a promising treatment for concussions and brain injuries. By boosting cellular energy, improving blood flow, and reducing inflammation, red light helps the brain recover naturally after trauma. Clinical studies from institutions like Mass General Hospital and JAMA Network show it can improve brain connectivity, memory, and mood following head injuries.

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