Photos or Autos? (just personal interest, has no bearing on height that i know of).
Indica - sativa - hybrid? ("generally", sativa is tall, and indica is "generally" short. that being said strain and conditions can affect height greatly)
lights fixed or mobile; can they be adjusted? (how hard do the plants have to work to get to the light of the correct wavelength)
not only are you going to be limited in height, but width as well. here are 2 Auto Trainwrecks just past 60 days (30 to go). Left is two weeks older than the right.
These two plants are from the same seed order. This is in a 4x4x8 tent, 480 watts of light at about 5 foot from the floor. In about a week the one on the right is going to need more room on the left. So i will harvest the left in 10-14 days.
for reference the rez is 15 inches tall.
Happy Growing
