The light waves kill bacteria by disrupting their DNA. The trial compared standard disinfection with quaternary ammonium to three other cleaning methods: using quaternary ammonium followed by UV light, using chlorine bleach instead of quaternary ammonium and no UV light, and cleaning with bleach and UV light. January 29, 2013. Blue light has been used to kill potentially-lethal Pseudomonas aeruginosa bacteria (pictured) in the skin and soft tissues of lab mice. View 1 Images. Over the past few years The UV light dimerizes the RNA or DNA of organisms and can kill many types of pathogens like bacteria, virus, and fungi. Studies have shown to blue light can reduce bacteria in whole room As illustrated in Fig. 2, at relatively high fluences at which the 254-nm light is predicted to produce a significant decrease in SSI rates ( 1 ), 222-nm light kills MRSA almost as efficiently as a conventional germicidal UV lamp. However, 254-nm light is almost equally efficient at killing human cells ( 7 ). FIG. 2. This 38-watt UV lamp features 99% effective germicidal light to keep viruses, mites, and bacteria at bay in any room of the house, or even in your car. With three programs of 15, 30, and 60 Moreover, the rate at which a bacteriostatic antibiotic kills one species of bacteria, for example, Escherichia coli, can be markedly less than the rate at which it kills another species, for In-Office Treatments: “If you just had a peel or are acne-prone, using a combination of red and blue LED will kill acne-causing bacteria while reducing inflammation and redness,” explains Dr UV air purifiers use UV-C light (a light wavelength of 254 nanometers) that's absorbed by the DNA of microorganisms. The UV light doesn't immediately kill the organisms, but renders them unable to produce the proteins they need to survive and reproduce. This prevents them from causing harm and shortens their lifespan. Types of HVAC UV light systems Sanitizers are designed to kill bacteria, viruses, mold or fungal spores that can also be floating around. These things occur naturally, too, but they can make you sick if you’re exposed to high enough concentrations of them. The most common type of sanitizers right now are UV light devices. How do HEPA filters and UV light air purifiers work? In photodynamic antimicrobial chemotherapy (PACT), a combination of a sensitising drug and visible light causes selective destruction of microbial cells. The ability of light–drug combinations to kill microorganisms has been known for over 100 years ( Moan and Peng, 2003 ). However, it is only recently with the beginning of the search for TQ97c.