Here is my setup. Nothing overly fancy but it works
The first picture is my closet. The flowering chamber and clone area fit nicely in it. The only modification I have to make is to cut a hole in the wall through to the room behind it to exhaust the heat to because right now its being vented into the closet which keeps temperatures a bit too high but the plants are doing ok in it.
Inside the flowering chamber I have two of my girls flowering (day 60) under the 150W HPS. I also have just added 3 clones under the T5 to start them flowering. I had some wasted space so made use of it but at the cost of raising the temperatures even more - up to 88 closed and 86 open.
I actually decided to buy a 400w cooltube to put in there that way it will provide enough light for all my plants plus it will take temperatures down a bunch because the ballast is remote (150w is inside lamp) and I will be removing the T5...anyway sorry I just blabbed on.
Also forgot to add the fact that the plant on the right is about 3 1/2 feet tall and the plant on the left is about 2 feet tall, thats why she's propped up on books so both tops are about 10" from the top of the HPS...with the fans blowing the heat off the HPS into the 6" inline fan the tops don't get too hot, my hand is comfortable resting above the tops - thats how they say to gauge the distance of the light hehe.