How much UVB per plant?

Ordered one http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=350051380463&ssPageName=STRK:MEWNX:IT

I have 6 plants and it will be hanging down from the ceiling. Will this be enough for them?

I have read that UVB supplement lighting can drastically increase THC content. I personally don't use UVBs, although I am willing to spend the money on on to test that theory.

I would not use that as your primary light. But, as a supplement to a 400 or 600W HPS, it would certainly make a great addition in potency to 6 plants.

Also, UVB lights freak me out. I would wear sleeves and good sunglasses when in the room and cut them off when in the room for an extended period.