Beacon is part of the booming disinfection equipment market that’s aiming to banish germs from your home. The year is 2020. The month is April. And serial entrepreneur Brian Clark has just come across early research on a new frequency of light that can zap airborne viruses. Known as far-UVC (we’ll come back to that) the light emits low doses of a particular wavelength of ultraviolet light, which can kill viruses and bacteria without harming human skin (like conventional UV light does).