Blue light


What is blue light?

Blue light is light that is mainly emitted by the sun, but also by artificial sources with LED or compact fluorescent lamps such as computer screens, smartphones, etc. In the "rainbow" spectrum of visible light, blue light is divided into two very different types of radiation.


"Blue-turquoise" light

"Blue-turquoise" light is recognised as vital to the body's functioning. This type of light regulates our circadian cycles: it contributes to when we wake up, fall asleep, as well as to our general well-being.

“Blue-violet” light 

“Blue-violet” light is the band of the visible spectrum containing the most energy, hence its name HEV for "High Energy Visible Light" which is harmful to the body: it accelerates the ageing of our cells and we need to protect ourselves from it. 

Blue light: what’s the difference between sun vs. screens?

Blue light from screens doesn’t compare to the intensity of the sun, even though this type of light is becoming more and more prevalent in our daily lives: we are exposed to it earlier and for longer. The light intensity of the sun can be 1000 times greater than that of screens and you would have to spend 64 full days in front of your digital tablet for the equivalent of one hour of sun exposure. Another difference is that outdoors, the skin is directly exposed to the sun, whereas the eye only perceives what is reflected by the light.

1. Comparison using data
Light intensity for an iPhone X : Blue light (weighted power): 8.14 µW/cm2/ 1h dose = 0.0293 J/cm2
Light intensity for an iPad4 : Blue light (weighted power): 5.45 µW/cm2/ 1h dose: 0.0196 J/cm2

The effects of blue light

With blue high-energy visible light, a new skin enemy has been discovered, perhaps even more harmful than UVA and UVB. These harmful rays penetrate even deeper into the skin layers, reaching the hypodermis. With its intense energy - which gives it its name - blue light attacks all cellular constituents: lipids, proteins and DNA. These rays alone damage the skin cells in one hour of sun exposure². The damage is measured over the long term, hence the absolute necessity, in terms of public health, to protect yourself from the earliest age possible and throughout life. But these aren’t the only effects of blue light on the body. Other studies have shown that this blue-violet light leads to the formation of toxic reactive oxygen species that affect all the constituents of skin cells: lipids, proteins and DNA.


²Equivalent to 1 hour of exposure to the sun in our latitudes in summer. Journal of Investigative Dermatology (2010) 130, 259 - 269; doi : 10.1038/jid.2009.194; published online 13 August 2009)

Therefore, it’s reasonable to assume that in the long term, and especially as ageing erodes cellular defence mechanisms, exposing the skin to high-energy light can have a harmful effect that increases the ageing process and even has cancerous mechanisms. In addition, blue light acts on the pigmentation gene and stimulates the activity of melanocytes. This aggravates certain dermatoses linked to the functioning of melanin, such as pregnancy mask or post-inflammatory hyperpigmentation. Blue light therefore has potentially even more devastating effects than UVA, especially on darker skin. 

1. Cell oxidation: increased risk of mutation in key genes. DNA ALTERATION 


The dermatological solution against blue light

Eau Thermale Avène's innovation against blue light: the new TriAsorb™ sun filter

To fight the effects of blue light on the skin, Eau Thermale Avène Laboratories have developed a revolutionary new technology: the TriAsorb filter, inspired by the natural photoprotective power of melanin.

The TriAsorb™ filter allows the photoreceptors to work on the turquoise blue part of the light, exactly as melanin does, so as not to interfere with the body's physiology.


How does it work in practice?

Melanin, which is a function of each individual's phototype, is responsible for naturally providing the skin with the right photoprotection. It protects against the acute effects of the sun's rays on a daily basis - like sunburn - but also against the long-term effects, like photoageing and skin cancers. It also protects against blue high-energy visible light. Inspired by this unique function, TriAsorB™ provides the skin with very broad and effective photoprotection and reflects the harmful part of the solar spectrum, which includes UVB, short UVA, long UVA, but also blue high energy visible light.

A formula that meets Avène's dual commitment to respect the skin and the environment

The new TriAsorB™ filter full meets Pierre Fabre Dermo-Cosmetics' Conscious Care approach. Useful, well thought-out and ethical, it aims to formulate active ingredients that are increasingly respectful of the skin and the environment. 

A safe formula 

The new TriAsorB™ filter is an organic molecule that has been spread through the formula. The technique used to add the filter guarantees its safety. Thanks to TriAsorB™, we have achieved the feat of reducing the proportion of filters in the new Intense Protect 50+3 by about 10% while maintaining high quality protection.

Four years of work and 30 toxicology studies were carried out to prove the filter’s safety. The ultra safe TriAsorB™ filter stays on the surface of the skin, whether skin is healthy or thirsty.

3 Tests show evidence that the filter protects cellular DNA from damage due to UV stress.4

3. Topical application (5 Measures carried out on human skin explants.
3 models used: Healthy skin/ Healthy and irradiated skin/ Impaired and irradiated skin
4. Topical application (2 Measures carried out on reconstructed epidermis - follicular models. Stress: acute UV exposure. Quantification of DNA damage (by LC/MS analysis (liquid chromatography/mass spectrometry))
av_solaires_engagement_phytoplancton-zooplancton_1x1 1620x1620

Respect for the environment

Eau Thermale Avène Laboratories continues with its environmentally responsible approach and commitment to limit the impact of sun filters on the oceans. The new TriAsorB™ filter has passed numerous tests under experimental conditions which proved that it was non-toxic on 3 key species of marine biodiversity: one coral species, one phytoplankton species and one zooplankton species.




High Sun Protection Tinted Compact SPF 50 Beige

  • The ultra-broad-spectrum suncare product meets the highest requirements for the skin while minimising our impact on the environment.
  • 95.3% reduction in DNA damage induced by blue light¹ 

¹In-vitro test. Topical application (2 Measures performed on reconstructed epidermis. Stress: simulated exposure to blue light. Quantification of oxidative DNA damage by immunohistochemical analysis.

Discover more
Back to top