Well my question is...if it effects humans,in what way does it effect the plant if the plant is constantly bombarded 18 out of every 24 hours?

All living things are effected by radiation,what effects humans must have some sort of effect on plants as well.

Anyone heard anything on this topic?

But sunlight also puts out UV radiation, this is what tans or burns us. Plants are used to it. Unless you are using a really weird light source, there won;t be enough UV to hurt the plants.

Is it single-ended or double-ended? And does it have a glass shield over it? Single-ended bulbs usually have somewhat of a shield built in. Double ended bulbs need a shield. And even beyond that, there's still some UV release.

Let me take a second to make a quick but strident warning: *never* use a double-ended bulb without a shield, or a damaged single-ended bulb. You can literally go blind from it. It's happened. It'll happen again. Just don't do it.

Anyways, for normal, properly designed systems, just don't look directly at the light or sit around under it for long periods. Treat it like the sun. And plants are already capable of dealing with some UV; they get it from the sun outdoors, after all. If you're really concerned, get them some extra orange light. Orange stimulates carotenoids (chemicals like lycopene, beta carotene, lutein, etc) which helps produce antioxidants. It also contributes to growth, although not as much as red and blue light. I added a chain of orange LEDs to each of my LED grow chambers for this reason (even though orange LEDs aren't very good). The new UFO lights are starting to come with orange, also -- same reason.