[daytonians]

I dissagree. Although blacklights give off UV light that is near the visible spectrum which is not as bad as UV with longer wave lengths, all UV light is damaging to both corals and people's eyes. I would not use one for any extended length of time. There are cool to turn on for short periods to show people the colors, but that's the most I would do. UV causes cataracts, so don't use them long if you like the ability to see.