Estimable @G-paS,
You were not hoaxed. At low levels ozone is in common use for sterilizing everything from dentures to city water supplies. Including Air purification!
These lights emit enough ozone to pretty much kill every living thing in the room. Right down to the Spidery level. Kills plant too, so empty grow room only!
After an hour or so, you crank up the fans and vent outdoors. Don’t go this if you can’t vent the ozone!
Hope to be helpful,
-Grouchy