These lights can serve a couple of purposes based on the configuration. A basic single bulb ultraviolet light can shine UV-C light between 100 and 280 nanometers. This placed on the backside of an evaporator coil can prevent microbial growth on the coil. There are also air purifying systems that use this light along with a carbon and titanium matrix to create a photocatalytic reaction, killing any molecules or VOCs coming through the systems air. Pure Air are experts at educating and helping the customer select the perfect fit for them.