You need a spectrum of UV light that is dangerous to humans, requires time and not just a flash, and it has to directly shine on every surface you intend to decontaminate.this!!! Ive been wondering about parks, and retail like Walmart for shopping carts. Couldn't they use a uv light or something (not a scientist and too lazy to look) that they could build tubes that you push the shopping carts through before they are put with the others, or ride vehicles go through before reboarding (sans people) that would disinfect. I mean you could use chemicals (messy) or heat (damage vehicles?) but a light that would kill everything to me sounds like a no brainer. Especially because I think this is going to be a new normal with things being more sanitized than it was before.