Hey man, I'm not an expert on this subject yet but - (and hopefully I don't come off condescending!)
Why only one plant boss, you could get higher yields, quicker with more plants. i.e. if you use one plant your going to have to veg/heavily train it to get the real benefits from Vert growing. (i.e. to make the plant go all around the bulb - but there is much less heat so it can be closer)
I'll dig up some posts from other forums, there was a nice post on icmag about "The benefits of vertical growing" from back in 2009 - seriously quality posts.
*Found them
The above post is incredibly informative, people running 400w, 600w, 1000w, more in that thread.
We even have our very own
Heath Robinson who did an amazing job of getting 46oz off a 600watt.
link
That was one of the best grows I have ever seen, most people who have such successful grows probably wouldn't put them on the interwebs.
Good luck, If you make a grow journal I'd love to see how the AK48 does, I think I might pick some of that up + some Sativas for when I do my own grow...