Yup Headshake,

I'm sorta sorry I came out of the closet on that uvb thread (as a uvb user).
Think I realized that Weez may not be a user when he was untypically quiet towards that thread. While I have used it for quite awhile, I have never really been comfortable about recomending it. It probably falls into the same catergory as CO2 use, when eveything else is dialed in it, then you try it.

It is my opinion uvb can make a difference. It will be pretty easy to test if it will make a difference to you. Do a grow with and without, back to back, same strain, same conditions.

1)UVB will not pass thru walls, or even cardboard and is greatly diminished just passing thru glass. It will be safe in your box as long as you can't see it.
2)I would start at 2hrs/day in middle of light period "high noon" and see if you get an improvement. I don't think I'd use it for more then 4hrs/day, like Weezard said it ain't good for plants either (in large amounts).

And hey, isn't marijuana man believeable, he's like a true profesor in his lectures. Plus he uses some common scence. Also, his take on THC claims...gotta luv it.