Are you perhaps thinking about UV from sunlight?

And, will this unit be a substitute for tv in the summer where you will be watching bugs get zapped hours at a time?

Is is the UV you are worried about, or all the exploded mosquito carcasses spread around the room?

I suppose the ultra violet light might cause the same effect as a sunburn after enough time at very close range. If I wanted such a gadget, I would consider a screen for the area where it is mounted and limit my exposure behind the screen. I'm not sure UV attracts mosquitos, but if it doesn't do a perfect job you will still have a few coming in an open window. Or are you trying to attract them after they have already gotten in? In that case you couldn't use a screen. We used to have a problem before the county set up a mosquito control board and pretty well wiped out the breeding grounds. When we had them we use a towel to smack them when one or two got in.