Just passing along info that I read last night...
Nongreenthumb posted in a journal last night that those things are great for herbs like parsley...but they are a
for growing pot. Said that the light is not good enough, and you could only grow one plant to maturity~ without hacking it up, buying a decent light for it, etc. Said he had never seen anyone have a decent yield with it! He reccomended that for the money you spent on it, you could build a better one cheaper, and use that extra saved money for a good 400, 600 watt light.
Just passing along~ I've never used one~
Personaly, I bought all materials, scavenged a few materials, for under 120.00 lights seeds, nutes and all, check out my journal for a price/material list~ hope this helps