Intensity plays a role in the effective irradiation of airborne contaminants. Due to the size of certain microorganisms they require higher doses of UVC to become inert. The Inverse square law states that light is less effective the farther away from the source. We have designed all our products to maximize the intensity inside the unit by using multiple UVC bulbs in a small space. The use of multiple bulbs ensures proper intensity is provided to irradiate both small and large microorganisms.