thanks bud they are doing fine though, short so far. I've grown with a blacklight in my growroom before and had really sticky plants so I'm doing it again. I don't think it is enough to hurt them bud its only 35 watts. UV light is in natural sunlight and these plants are looking like outdoor plants more and more everyday. I think its mimiking natural sunlight and my plants are fooled and think they are outside. So thanks for the info and it may hurt my plants if there was a large amount of UV light but like I said it is only 35 watts and they are growing fast. you just proved to me there was UV light in a natural ecosystem so that would in fact supplement my plants need for a more natural ecosystem. thanx for the info but I am not taking out the blacklights just yet, its only 35 watts no big deal.