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Prolonged exposure to UV lamps could be damaging to humans, causing sunburn and skin cancer as well as damaging the eyes, but since the lamps are usually installed in a closed-off environment (water tank, inside an air purifier, etc) and should always be off when the compartment is accessed, this has not been a huge concern. Other UV lamps purify the air when installed into a home’s HVAC system. Some air purifiers can accommodate a UV light to sterilize the air as it passes through the unit. In all of these applications, UV is typically used in the form of germicidal lamps in sealed-off rooms, water tanks and forced air systems to expose microorganisms to the electromagnetic radiation. In the field of water purification, UV helps to sterilize drinking water and wastewater. Ultraviolet germicidal irradiation has been used since the mid twentieth century as a disinfection method in the food industry, medical field and other sciences.
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Niels Finsen won the 1903 Nobel Peace Prize when he used UV to treat a skin condition called lupus vulgaris. People soon realized the potential of UV light for sterilization and in 1903, they discovered that a wavelength of 250-260 nanometers was the most effective for that purpose. More than 100 years ago, in 1878, two scientists published a paper about the short-wavelength light and its ability to sterilize bacteria. A UV filter is designed to neutralize biological organisms passing through the ultraviolet rays by altering the DNA of bacteria, viruses and mold spores and inhibit reproduction.īrief History of Ultraviolet Germicidal Irradiation
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UV is not effective for some bacterial and mold spores that have become resistant. It doesn’t promise to trap airborne particles like a HEPA filter or to remove airborne chemicals by way of adsorption like an activated carbon filter. Sometimes, multiple passes of air may be required. The air must be moving past the lamp so that the UV can work. At the right exposure, the ultraviolet rays penetrate a cell’s outer structure and alter its DNA, causing cell death. At this wavelength, biological contaminants cannot survive prolonged exposure to UV light.
Lightworks pro smoke fx add portable#
The UV lamps designed to kill germs in portable air purifiers typically consist of low pressure mercury vapor lamps with a UV radiation wavelength of 263.7 nanometers. The electromagnetic radiation of UV light works with wavelengths that are shorter than visible light to disrupt bacteria, viruses and other micro organisms. In the world of air purification, ultraviolet germicidal irradiation (or UV) is just one of many possible filters to consider -usually recommended as an add-on to other filters, not as a stand-alone option. Air Purifiers for Home, Allergies & Asthma +.Air Purifiers for Home, Allergies & Asthma