Infrared light has been known since 1893 by Niels Finsen. It is a non-invasive and painless treatment, also called near infrared light (NIR), photobiomodulation or biostimulation. The red light that we can see with our eyes is also called low-light light therapy or red light therapy (RLT). It uses low wavelength or red light. We can perceive as heat and operates on the skin’s surface. It has shown effectiveness in the cell regeneration. While red light goes through the skin, the infra red penetrates all tissues to the bones. It stimulates the mitochondria to produce energy essential to our body function.
The spectrum of infrared light is in a range that we cannot see with our eyes but still can go through deeply into our body. The cell absorb the light and a metabolic response is created through the mitochondria the generate energy called ATP. Therefore, regeneration of the cell is enhanced and repair is promoted in the cell, then the body. There is no side effects known at this day but we know that even using the NIR is safe for 20min a day as long as the eyes are protected. The eyes are sensitive to the heat and the infrared and red light can strain the eyes.
The wavelength used ranges between 600 and 900 nanometers.
The time to use IRLT is 5 to 20min but one session is not enough. Several sessions and maintenance are essential to get the results.
There are other light therapies such as blue, green or yellow light. The difference between red light therapy and blue light therapy is that the blue light only penetrate in the pores and clean the microorganisms whereas red light enters the cells, help replication of the cell and promote elastic and collagen formation. They are both good for skin health.
Another type of light therapy is the UV light but it has shown that it can create cancers and is dangerous.