I believe the infared scanning you've heard about if the practice of pigs with wings scanning the roof tops of potential grow houses for "hot spots" created by the massive heat all the high intensity lighting puts out. I wouldn't worry about that at all, that is unless you've got a couple thousand watters with your hot air exhausting into the attic or something.

Just plant twice as many seedlings as you intend to grow and select the nicest females you've got the room for. I wouldn't fuck with the light cycle, it'd probably just send the plant into shock and stunt it's growth.

Good luck with your current grow. :thumbsup:

By the way, you're in the Outdoor forum.