Sounds like good advice forgetiwashere. Ya marv, i was asking about the height you have above your screen, before you hit the light. Because you said you would have a space problem, im assuming you ment because of height issues. Like i said though, i personally try shoot for about 8-12" above the screen as finial stretch height, that way you can get some big colas going on. Which in that case, if you have say 2.5' above your screen, before the bulb, your golden. From here, it looks like to have filled maybe 1/3 of each screen? If they're indica dom, like forgetiwashere said, say 2x stretch.... But remember that 2x stretch is distributed among alot more branches the most folks, simply because your scrog'n. So ya, go with your gut. Fill that screen to where ever feels right, be it 1/2 or 3/4. And learn what she will do. So much guessing is involved this time, that its just too hard to say.