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UV Lights for Mold Prevention

Hospitals and clinics have been using ultraviolet radiation for many years in order to maintain a sterile environment by controlling microbial growth. Because of the danger of exposure to excessive levels of radiation, the use of UV lights in these conditions is not practical for general application where human beings and animals live. Yet, UV lights can be used effectively in the home environment if they are placed in areas where they can be effective for mold prevention.

  1. How UV Lights Irradiate Mold

    • The C-band of the light spectrum, which falls in the ultraviolet range, is the part of sunlight that helps to control fungi, bacteria, viruses and other minute biological particles in the natural environment. The process by which these microbial forms are controlled is a result of irradiation, which damages RNA and DNA. The photochemical elements within the C-band are the key factor. UV lights that emit the C-band simulate the irradiating effect of natural sunlight. This is the science behind the application of UV lights in sterile environments, and this same principle is adaptable for home use.

    Where to Use UV Lights

    • The placement of UV lights in the home environment is key to mold prevention. Since direct and continuous exposure to UV lights can be harmful to mammals, a more practical application of this principle is to place the UV lights in areas that are not commonly accessible. Perhaps the most ideal location for UV lights is within the HVAC (heating, ventilating and air conditioning) system, especially if the UV lights are placed near elements of the system where moisture more often collects. This would include the coils, condenser and drip pan. The contrast in air temperatures around these elements results in condensation of water molecules in the air, causing moisture buildup. Moisture is one of the prime factors in mold colonization, and UV lights that are located near those elements of an HVAC system that are more apt to collect moisture will be effective in mold prevention.

    Other Relevant Factors in Mold Prevention

    • Although UV lights are very effective when used in this manner, this is only one aspect of total mold prevention. Controlling moisture buildup in the interior atmosphere can also include improving the weatherproofing of the home. Replacing worn weatherstripping on doors; caulking windows and other openings, such as dryer vents and gaps in exterior siding; and improving the insulation in the attic can all help UV lights prevent mold.

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