The delivery of UV-C energy is based on the simple laws of physics, specifically the Inverse Square Law. This law states that every time the distance is doubled, the intensity of light energy is reduced by 2 squared or ¼ of the power, not simply by ½. For example, if the distance to a surface increases from 1ft to 2ft from the UVC lamp, we are left with only ¼ of the energy. If the distance to a surface increases from 1ft to 10ft. from the lamp, we are left with only 1/100 of the energy.