How much room you have will decide that for you. when you are about 1/3 -1/4 of the way to your height restrictions, you will want to hit it. Try tying them down or supercropping them to help them bush up a little. The light sound like it will do the job. I got to get a flouro set-up for my veg room. Did you get a good deal? Lastly, I'm still relatively new to growing, but I read in a ED Rosenthal book( and he's pretty much the man), that the longer you veg, the higher the thc level. Although, he says it does kinda reach it's peak at around 5-6 months. So, I say, veg as long as you can.
edit: before I get smashed obviously genetics play a huge role in TCH levels and environment and all the other good stuff.