Photobiomodulation (PBM):
what red light does for your cells

All cells in the human body have light receptors. They therefore all have the capacity to transform light into energy.

Light is essential

Did you know that we spend 90% of our waking time indoors, under artificial light that does not stimulate our body? Our contemporary lifestyles cause poor light hygiene. But our body needs natural light to function properly.

The lack of exposure to daylight is not without consequences, it can:

  • cause inflammatory syndromes, precursors to the onset of chronic diseases
  • influence our cognitive performance: lack of concentration, reduced alertness, etc.
  • disrupt sleep and sleep quality, which will disturb our mood, influence our stress and anxiety levels…

Helight™ has set itself the goal of providing a solution to the lack of natural light.

Our light provides a signal capable of helping the natural process of returning to cellular homeostasis. It also promotes sleep and good quality sleep.

number of study about light

“Photobiomodulation (PBM) is the most exciting growth area.” *

For over 100 years now, nearly 5,000 scientific studies have demonstrated the positive effects of light on our cells. Similar to photosynthesis for plants, reaserchers callthis process is called “photobiomodulation’’.

* Michael R. Hamblin Ph.D, Associate professor, Harvard

The long history of photobiomodulation


Niels Ryberg Finsen from Danemark receives the Nobel Prize in Medicine for discovering the effects of light in the treatment of certain diseases.


NASA scientists recognize that red light has a beneficial influence
on the circadian rhythm of astronauts, especially falling asleep.


Doctors Berson and Hattar demonstrate the presence of photoreceptive glial cells in the retina. These contain a photoreceptor pigment called melanopsin which explains the influence of light on our biological rhythm.


Professor René-Jean Bensadoun, based on a meta-analysis of 33 clinical studies published worldwide, highlights the effectiveness of light on inflammation, tolerance, pain and healing time in treating certain skin ailments.


The Nobel Prize in Medicine is given for the discovery of molecular mechanisms controlling the circadian rhythm, demonstrating that all our cells have photoreceptors and are all sensitive to the circadian rhythm.


Figueiro and his team show that exposure to red light during sleep can significantly reduce inertia upon waking.

From red light to energy

It is inside our cells that the phenomenon happens: to put it simply, they convert the light they capture into energy. The process induces a cell regeneration effect.

Here is the scientific explanation: our organism has a natural ability to repair itself. This ability deteriorates with age or occasionally, at certain periods of life. Natural cellular energy is produced by the mitochondria, the real powerhouses of our cells.

These mitochondria are equipped with photoreceptors (cytochrome C Oxydase enzyme) which capture photons from light. This generates chemical reactions and leads to the production of ATP (adenosine triphosphate), the main source of energy for cells.

These photoreceptors have a particular affinity for red light, more precisely for the wavelength used by Helight™ (630nm).

Health is a state of complete physical, mental and social well-being and not merely the absence of disease or infirmity.

Preamble to the constitution of the World Health Organization (WHO)

The benefits of red light help optimize the most powerful machine in the world: the human body!

Just like water, light is one of the essential elements of life. In sufficient quantity and quality, it provides the body with many benefits, although sometimes unsuspected.

During the past decade, numerous teams have studied the influence of light on various biological processes (regulation of body mass, general metabolism and homeostasis), and on well-being (depressive syndrome). Preclinical studies have made it possible to describe the consequences of an excess of light or conversely of a total deprivation of light.

The observed effects of red light on cognitive functions

The action of light on cognitive functions will manifest itself in the form of a reduction in stress and anxiety, an action on mood and a reduction in symptoms of depression and sleep disorders.

According to published studies, there is an increase in alpha waves as well as an improvement in attention, alertness, memory and concentration. Improvements in sleep disorders were assessed using the Pittsburgh Sleep Quality Index (PSQI) test.

Red light and its positive effects on cognitive functions

  • decrease in brain activity as measured by electroencephalogram (EEG)
  • improved attention and alertness
  • improved concentration, memorization and 3D representation
  • improved mental availability
  • positive influence on mood and emotional management

Red light and its effects on the main biological markers

  • lower heart rate
  • lower respiratory rate
  • low blood pressure
  • increased alpha and theta waves, deep sleep and deep relaxation


Light at the service of medicine and health

Medical research has highlighted many actions of light on living organisms.

Each discovery led to technological innovations. This is how we went from the benefits of white light rich in short wavelength component of blue light with the discovery of melanopsins, to red light, rich in long wavelength which gives the same vigilance results without interfering with melatonin secretion.

These discoveries therefore challenged the idea that all types of light could give comparable effects. The specificity of the light emitted by Helight™ devices explains the very positive results obtained on the improvement of cognitive functions and physical recovery.


The effects of light on the human body have been observed for a long time :

  • Blue light in maternity hospitals to treat jaundice or jaundice in infants
  • Vitamin D synthesis after sun exposure
  • Red light phototherapy combined with a photosensitizing product
    to treat skin lesions such as basal cell epitheliomas
  • Light therapy to treat seasonal depressions
  • Supportive care in oncology after radiotherapy and chemotherapy in treating of mucositis
    treating of mucositis
  • Photobiomodulation (PBM) to treat scars and pain in medical
  • PUVA therapy in dermatology
  • The use of lasers in surgery
  • The use of infrared light in rehabilitation in the treatment of pain


During its history, photobiomodulation has been used for its effects on the body and recovery :

  • medical aid for wound healing, pain management and reduction of inflammation
  • aesthetic anti-aging and the beneficial effects for hue, hairloss or reduction of stretch marks
  • improvement of cognitive functions, well-being, relaxation and sleep.

“Helight™ chose to use only a quasi monochromatic red light, at a wavelength of 630 nm for two reasons: first, this red light is recognized by scientists for its efficiency and then, it is considered as devoid of side effects and is not toxic to the retina. ”

Jean-Marc Moncorger

Ph.D, co-founder of Helight™

When red light helps us get back to sleep

We now know that the low exposure to natural daylight associated with the use of screens on phones, tablets, computers and televisions – with a predominantly blue light component – disrupts the circadian rhythm and the quality of sleep.

A recent study by the French National Agency for Food, Environmental and Occupational Health Safety (ANSES) concludes in this regard.

At the opposite, exposing yourself to red light helps to regulate this circadian rhythm and reconnect with better light hygiene.

What scientists have to say about it

“I think every household will have one, two LED devices…”
Michael R. Hamblin Ph.D, Associate Professor, Harvard

“Photobiomodulation is a new frontier in medicine.”
Dr. Andrei Barasch, Doctor, Weill Cornell Medicine

“Photobiomodulation has an analgesic, anti-inflammatory and cell and tissue regeneration effect.”
Professor René-Jean Bensadoun Ph. D, Oncology

“With the red light, I speed up time, I help the body to recover.”
Olivier Caselles Ph.D, Medical Physicist Ph. D – IUCT – Oncopole Toulouse

Some examples from the 5000 scientific studies published on the positive effects of red light

Red light is an increasingly invested and exciting field of scientific study. Find out what scientific studies on red light say.

‟A recent finding reported in Mitochondrion may become the cornerstone of a therapy of stress-related disorders.”

Hroudova, J., Fisar, Z., Kitzlerova, E., Zverova, M., and Raboch, J


‟Photobiomodulation (PBM), also known as low level laser therapy (LLLT), is the application of phototherapy, often from a red or near-infrared laser, or from a non-coherent light source, such as a light emitting diode (LED). It has been reported in over a thousand scientific publications to have therapeutic efficacy for a wide range of disorders in humans without any observed harmful effects.”

Fredric Schiffer, Martin H Teicher & Ann Polcari


‟Among the most fascinating experimental applications of LLLT (photobio- modulation) are those related to enhancement of normal brain function and the treatment of memory loss and mood disorders.”

Julio C Rojas & F Gonzalez-Lima


“Exposure to red light from a session for 14 days improved sleep, melatonin in the blood and improved performance of players in a professional women’s basketball team”

Sport Biological Center, China Institute of Sport Science, Beijing, China; †Department of Kinesiology, Macao Polytechnic Institute, China; Department of Kinesiology, Beijing Sport University.

Jiexiu Zhao, Ye Tian, Jinlei Nie, Jincheng Xu, Dongsen Liu

Discover Helight™ Sleep


80% of our users recommend it *.


Helight™ Sleep uses a specially calibrated red light to help you fall asleep, simply and naturally.

We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits.
By clicking “Accept”, you consent to the use of ALL the cookies. However you may visit Cookie Settings to provide a controlled consent. Learn More

Privacy Settings saved!

Hi there!

We're the cookies

We waited to make sure that you were interested in the content of this website before bothering you, but we would love to be your companions during your visit...Is that OK with you?

These cookies are necessary for the website to function and cannot be switched off in our systems.

In order to use this website we use the following technically required cookies
  • wordpress_test_cookie
  • wordpress_logged_in_
  • wordpress_sec
  • YSC
  • Ls_smartpush
  • _lscache_vary
  • wp-wpml_current_language

For perfomance reasons we use Cloudflare as a CDN network. This saves a cookie "__cfduid" to apply security settings on a per-client basis. This cookie is strictly necessary for Cloudflare's security features and cannot be turned off.
  • __cfduid

Decline all Services
Accept all Services