Scientifically proven efficacy of blue light

There are currently over 2000 peer-reviewed scientific articles on the efficiency of blue light in eliminating different microbes. The efficiency of photocatalytic TiO2 coating has likewise been proven in numerous articles. We have also used accredited 3rd party laboratories to test the efficiency of the complete Spectral Blue system, combining the powers of natural blue light and photocatalytic coating.

Laboratory tests against viruses: SARS-CoV-2 and Influenza A

New 2021 September: Visible blue light has been shown to inactivate viruses such as SARS-CoV-2 and Influenza A. Read the whole article here. 

Laboratory tests against most common causes of Healthcare-Associated Infections

E. Coli - Number #1 in Healthcare-associated infections (HAIs)

Spectral Blue test results vs. E.Coli bacteria (2020)

E.Coli is the most common cause of hospital acquired infections in Europe (15,9%, ECDC 2012).

In summer 2020, laboratory tests were conducted at the FINAS accredited MetropoliLab to determine the efficiency of LED Tailor’s photon disinfection devices in inactivation of E.Coli (ATCC 25922) with the catalytic coating.

The bacteria were spread out on the bottom of plastic petri dish and irradiated with low density blue light (0,7mW/cm2) under regular office conditions. Each test result contains three parallel samples from each point of analysis. Error bars show SD (Standard deviation).

2-hour irradiation resulted in reduction of over 99,9% (over 3 log10).

Already after 30 min the reduction was 99% (2 log10).

The results show that blue light and photocatalytic coating is the most effective method of disinfecting surfaces that is not harmful to humans or materials. In this test measurements were made for bacteria, but in photon disinfection, viruses die faster than bacteria.

Blue light vs. other most common causes of Hospital-acquired infections (HAIs)

The below table lists the most common causes of healthcare-acquired infections in Europe, according to the European Centre for Disease Prevention and Control (ECDC). The ECDC conducted a study from 2011–2012 on vectors of healthcare-associated infections in 273,753 patients in 1,149 hospitals in 29 European countries.

Most common causes of healthcare-associated infections (HAIs) [ECDC, 2012]

The table also contains data on the efficiency of blue light inactivation of microbes collected from different sources. Although different microbes respond differently to blue light, it is nevertheless fatal to all of them.

Links to review articles on the topics

Please note that some of the articles may require a paid subscription or one-time purchase. The article licenses do not allow us to share them online.

How blue light affects microbes:

Wang, Y., Wang, Y., Wang, Y., Murray, C. K., Hamblin, M. R., Hooper, D. C., & Dai, T. (2017).
Antimicrobial blue light inactivation of pathogenic microbes: State of the art. Drug Resistance Updates.

Hessling, M., Spellerberg, B., & Hoenes, K. (2017).
Photoinactivation of bacteria by endogenous photosensitizers and exposure to visible light of different wavelengths - A review on existing data.
In FEMS Microbiology Letters.

How photocatalytic coating affects microbes:

Howard A. Foster, Iram B. Ditta, Sajnu Varghese & Alex Steele
Mini-Review: Photocatalytic disinfection using titanium dioxide: spectrum and mechanism of antimicrobial activity.
Applied Microbiology and Biotechnology volume 90, pages 1847–1868 (2011)

Je-Wen Liou & Hsin-Hou Chang
Review: Bactericidal Effects and Mechanisms of Visible Light-Responsive Titanium Dioxide Photocatalysts on Pathogenic Bacteria.
Archivum Immunologiae et Therapiae Experimentalis volume 60, pages 267–275 (2012)