Oh, thanks. I will explore more on this.
I just want to emphasize how important it is for you to not be in the room with it when it's on. It can seriously damage you. There are stories of them being used at parties cause they looked cool and 12 hours later everyone is in the hospital cause it feels like their eyes are melting in permanent lava, their exposed skin is severely burned, it sounds like a horrible experience. Safety precautions are essential because it doesn't feel wrong when it's happening, but only hours after exposure. Also the lights can look really cool, so unsuspecting people may cause themselves serious damage without knowing.
Thank you for the detailed warning.
I actually decided to let go of this idea after OP’s warning and reading a bit about it. Because one problem will be that I will have to enter to switch off and on and even though it could be a short lived exposure I was scared. Though I’d read more on this what it could kill in the room. The thing is it might not help anyway. It is seasonal/situational and it happens in other places as well or outside if sun is not up. So whatever it is (general guess is pollen, dust, dust mite, sudden temperature changes?, general pollution etc) it is already in me or on me or everywhere around me. So I guess it might rather help more with an allergy test and if I am lucky I can find what I am allergic to.
UV is not so dangerous that you can't step in the room for a few seconds. Moreover, there's a significant number of precautionary measures you can take, like wearing UV-resistant sunglasses when you enter the room. There are also UV lamps that have timers on them, so you can have it automatically turn on and off when you're not there.