Couldn't agree more with Tony. UV light that the intensities needed to kill to microbes is very bad for your eyes and skin even for short amount of time. In our lab if the UV light is on ofr the surface sterilization of the laminar hood and other instruments no one is allowed inside the room, only 10 minutes after the light has gone off are we allowed in. There is also an entire air exchange in the lab. because UV light creates Ozone which is a very damaging reactive oxygen species.