Even before COVID-19, scientists have looked into UV Lighting to kill viruses and bacteria. UV Lighting gets into the cells of the bacteria and viruses and messes with their DNA. However when humans are nearby this would also affect their normal cells (i.e. causing skin cancer etc.)
However scientists were looking into a more harmless UV lighting option, called Far-UVC lighting low in frequency enough to not affect humans cells, not penetrating further than the dead skin cell layer, but since bacteria and viruses are a lot smaller, they would still be affected. It also apparently works in seconds.
It has not yet been proven that this also works against the Covid-19 virus strand, however it might be an interesting idea for crowded places where potential dangerous droplets could instantly be made ineffective.
Whether these lights could be introduced for corporate events is still a question in terms of it working for Corona, however it does work for other Influenza strands and bacteria which could still have positive effects.