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The Science of Light Therapy

Light Therapy & Photobiomodulation is the process of using specific wavelengths & doses of light to improve health.

At JustLight, we are committed to breaking down the amazing science of Photobiology, the study of light
on life.

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What does Light Do?

Light Therapy increases blood flow, increases energy, reduces inflammation, and much more.

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Heals Brains

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Reduces Inflammation

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Heals Wounds

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Circulates Blood

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Grows Hair

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Supports Sleep

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Immune Support

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Improves Skin

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Meditating woman healing from red-light therapy
Animated JustLight Sunflower advanced smart light therapy healing plant

Daily Health

Humans require daily light baths like we require drinking water.

Light increases blood flow & energy while reducing inflammation and inhibitory toxins.

Sunflower makes full-body light bathing easy.


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Brains Require Light

Light Therapy increases cerebral blood flow, increases neurogenesis, increases angiogenesis, and reduces inflammation.

Clinical Reviews of Light Therapy / Photobiomodulation

Mechanisms of Photobiomodulation

Is light-emitting diode phototherapy (LED-LLLT) really effective?

“Provided an LED phototherapy system has the correct wavelength for the target cells, delivers an appropriate power density and an adequate energy density, then it will be at least partly, if not significantly, effective. The use of LED-LLLT as an adjunct to conventional surgical or nonsurgical indications is an even more exciting prospect. LED-LLLT is here to stay.”

Proposed Mechanisms of Photobiomodulation or Low-Level Light Therapy

“One of the most important chromophores is cytochrome c oxidase (unit IV in the mitochondrial respiratory chain), which contains both heme and copper centers and absorbs light into the near-infra-red region. The leading hypothesis is that the photons dissociate inhibitory nitric oxide from the enzyme, leading to an increase in electron transport, mitochondrial membrane potential and ATP production.” --- Mechanisms and applications of the anti-inflammatory effects of photobiomodulation “Photobiomodulation (PBM) also known as low-level level laser therapy is the use of red and near-infrared light to stimulate healing, relieve pain, and reduce inflammation. The primary chromophores have been identified as cytochrome c oxidase in mitochondria, and calcium ion channels (possibly mediated by light absorption by opsins). Secondary effects of photon absorption include increases in ATP, a brief burst of reactive oxygen species, an increase in nitric oxide, and modulation of calcium levels. Tertiary effects include activation of a wide range of transcription factors leading to improved cell survival, increased proliferation and migration, and new protein synthesis.”

Non-mammalian Hosts and Photobiomodulation: Do All Life-forms Respond to Light?

“Photobiomodulation (red or near infrared light) has been shown to have beneficial effects on many different life-forms. Although many pre-clinical studies have been carried out in mice or rats, and clinical studies in humans, it turns out that all life-forms from bacteria and fungi, to paramecia, worms, insects, fish, amphibians, reptiles and birds respond. Even plants respond to NIR light differently to photosynthesis with visible light.”


Therapeutic Efficacy of Home-Use Photobiomodulation Devices: A Systematic Literature Review

Light therapy or photobiomodulation (PBM), previously referred to as low-level laser therapy (LLLT), is a nonthermal irradiation in the red to near-infrared (NIR) range of the electromagnetic spectrum. This low-risk, noninvasive technology is widely used for pain reduction, acceleration of wound healing, and treating a variety of inflammatory related conditions.

Skin Health Clinical Reviews

Low-level laser (light) therapy (LLLT) in skin: stimulating, healing, restoring
“Low-level laser (light) therapy (LLLT) is a fast-growing technology used to treat a multitude of conditions that require stimulation of healing, relief of pain and inflammation, and restoration of function. Although the skin is the organ that is naturally exposed to light more than any other organ, it still responds well to red and near-infrared wavelengths. The photons are absorbed by mitochondrial chromophores in skin cells. Consequently electron transport, adenosine triphosphate (ATP) nitric oxide release, blood flow, reactive oxygen species increase and diverse signaling pathways get activated. Stem cells can be activated allowing increased tissue repair and healing. In dermatology, LLLT has beneficial effects on wrinkles, acne scars, hypertrophic scars, and healing of burns. LLLT can reduce UV damage both as a treatment and as a prophylaxis.”


Photobiomodulation in Dermatology: Harnessing Light from Visible to Near Infrared

PBM has shown benefits in the treatment of acne, prevention and treatment of hypertrophic scars. It has shown promise in skin rejuvenation, the treatment of alopecia, cellulite, as well as other skin diseases. The discovery of new applications for PBM, already an effective form of treatment and prevention for many skin conditions, is continually expanding.


Adjunctive 830 nm light-emitting diode therapy can improve the results following aesthetic procedures

“A growing body of clinical evidence is showing that applying 830 nm LED-LLLT as soon as possible post-procedure, both invasive and noninvasive, successfully hastens the resolution of sequelae associated with patient downtime in addition to significantly speeding up frank wound healing.”


Infrared and Skin: Friend or Foe

This article will focus on key information suggesting that IR-A may be more beneficial than deleterious when the skin is exposed to the appropriate irradiance/dose of IR-A radiation similar to daily sun exposure received by people in real life.IR-A might even precondition the skin--a process called photo prevention--from an evolutionary standpoint since exposure to early morning IR-A wavelengths in sunlight may ready the skin for the coming mid-day deleterious UVR. Consequently IR-A appears to be the solution, not the problem. It does more good than bad for the skin.

Brain Health Clinical Reviews

Brain Photobiomodulation Therapy: A Narrative Review

“Brain PBM therapy enhances the metabolic capacity of neurons and stimulates anti-inflammatory, anti-apoptotic, and antioxidant responses, as well as neurogenesis and synaptogenesis. Its therapeutic role in disorders such as dementia and Parkinson’s disease, as well as to treat stroke, brain trauma, and depression has gained increasing interest.”


Photobiomodulation and the brain: a new paradigm

“Transcranial photobiomodulation (PBM) also known as low level laser therapy (tLLLT) relies on the use of red/NIR light to stimulate, preserve and regenerate cells and tissues. The mechanism of action involves photon absorption in the mitochondria (cytochrome c oxidase), and ion channels in cells leading to activation of signaling pathways, up-regulation of transcription factors, and increased expression of protective genes.”


Shining light on the head: Photobiomodulation for brain disorders

“The brain suffers from many different disorders that can be classified into three broad groupings: traumatic events (stroke, traumatic brain injury, and global ischemia), degenerative diseases (dementia, Alzheimer's and Parkinson's), and psychiatric disorders (depression, anxiety, post traumatic stress disorder). There is some evidence that all these seemingly diverse conditions can be beneficially affected by applying light to the head. There is even the possibility that PBM could be used for cognitive enhancement in normal healthy people.”


Review of transcranial photobiomodulation for major depressive disorder: targeting brain metabolism, inflammation, oxidative stress, and neurogenesis

“Based on the data collected to date, PBM appears to be a promising treatment for depression that is safe and well-tolerated. However, large randomized controlled trials are still needed to establish the safety and effectiveness of this new treatment for MDD.”

Pain Management Clinical Reviews

Mechanisms and Pathways of Pain Photobiomodulation: A Narrative Review
“A growing body of evidence supports the modulation of pain by light exposure. As such, phototherapy is being increasingly utilized for the management of a variety of pain conditions.”


The effectiveness of low-level laser therapy for nonspecific chronic low back pain: a systematic review and meta-analysis

“Our findings indicate that LLLT is an effective method for relieving pain in nonspecific chronic low back pain patients.”


Low-level laser therapy in acute pain: a systematic review of possible mechanisms of action and clinical effects in randomized placebo-controlled trials

“Photoradiation can modulate inflammatory processes in a dose-dependent manner and can be titrated to significantly reduce acute inflammatory pain in clinical settings”

Muscle Applications Clinical Reviews

Photobiomodulation in human muscle tissue: an advantage in sports performance?

“PBM can increase muscle mass gained after training, and decrease inflammation and oxidative stress in muscle biopsies. We raise the question of whether PBM should be permitted in athletic competition by international regulatory authorities.”


Low-level laser (light) therapy (LLLT) on muscle tissue: performance, fatigue and repair benefited by the power of light

“The ability of LLLT to stimulate stem cells and progenitor cells means that muscle satellite cells may respond well to LLLT and help muscle repair. Furthermore the ability of LLLT to reduce inflammation and lessen oxidative stress is also beneficial in cases of muscle fatigue and injury. This review covers the literature relating to LLLT and muscles in both preclinical animal experiments and human clinical studies. Athletes, people with injured muscles, and patients with Duchenne muscular dystrophy may all benefit.”


Does Phototherapy Enhance Skeletal Muscle Contractile Function and Postexercise Recovery? A Systematic Review

“Exposing skeletal muscle to single-diode and multidiode laser or multidiode LED therapy was shown to positively affect physical performance by delaying the onset of fatigue, reducing the fatigue response, improving postexercise recovery, and protecting cells from exercise-induced damage.”

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Video Gallery

At JustLight, we are constantly creating new video content to explain photobiology.

Learn about mitochondrial photorespiration, evolutionary dependence on solar power, and much more.

How Light is used in Respiration

When we breathe oxygen, it is transported to our cells by our blood.

Once the oxygen arrives at the cell, it is processed by our mitochondria and converted into usable cellular energy (ATP) in a process called Respiration.

When we don't get enough light, our mitochondria cannot properly function and they break down.

Why is Light so Imporant?

For millions of years, humans evolved outdoors with plenty of daily solar energy.

Today, we live inside and wear clothing, cutting off this required energy source.

This change of lifestyle leads to consistent & predictable diseases, diseases of mitochondrial dysfunction.

Humans are Solar Powered!

We all know we need sunlight for Vitamin D production, and yet the majority of us are still Vitamin D deficient.

It turns out, Vitamin D production is just one of the ways our bodies need sunlight.

In fact, humans are literally solar-powered, absorbing solar energy and converting to usable cellular energy.

Light for Hygiene & Health

For over 600 days, I have not used body soap, face wash, or deodorant, yet I am the cleanest human on earth.

The secret is Just Light.

Every day, I sanitize my body with a skin-safe dose of UV-C germicidal light.

The Future is Light!

Does Light Give use Energy?

Humans use sunlight to regulate the release of Serotonin in our bodies.

Serotonin is the 'feel good' hormone that makes us feel happy, focused, and energized.

If you do not get enough sunlight, your body will not produce enough Serotonin. Period.

Chronic Light Deprivation

Since the dawn of the industrial revolution, humans have moved indoors and worn clothing.

This has caused extreme deprivation of sunlight for most of our body.

Without proper solar energy, our cells break down and we suffer from predictable diseases.

As a society, we must urgently reckon with these facts.

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Let's Learn about Light!

At JustLight, we are committed to furthering the public understanding of the necessity of light for health.

Pick a category to start learning about more about Light!