Just answered this for someone else a few posts ago. Those things are bullshit. Only people who don't know any better get one of those.

Basically you cannot grow without height. You can veg with CFLs without much height but you cannot flower. I'm not going to repost all of the explanation, but you will pay over a grand and spend four months to grow $20 worth of weed.

How about you skip the wait, send me $1250 and I will send you $20 worth of weed instead?